The Third Blade: Good, Bad, and the Trouble with Both

Working notes, not prose. This page is a research packet for drafting the chapter: the brief, source material, questions, examples, reader perspectives, and the earlier draft.

Brief

Must: Show good and bad beginning as survival in simpler life forms. Then show that because we have an information world of culture, good and bad also become the survival of ideas, behaviors and ways of being.
Serves: It explains why values compete like organisms, and teaches the reader to ask why a belief survives separately from whether it is true. That question is central to not being cheated.

Quote options

“Everything, in so far as it is in itself, endeavours to persist in its own being.” — Baruch Spinoza, Ethics (1677), Part III, Prop. VI, trans. R. H. M. Elwes. [verified: https://www.gutenberg.org/cache/epub/3800/pg3800.txt] Why: Survival (the conatus) as the root that good and bad grow from. Could pair with Part IV, Def. I: “By good I mean that which we certainly know to be useful to us.” (same source, verified)
“I have called this principle, by which each slight variation, if useful, is preserved, by the term of Natural Selection.” — Charles Darwin, On the Origin of Species (1859), ch. III. [verified: https://www.gutenberg.org/cache/epub/1228/pg1228.txt] Why: The biological version of “good”: whatever gets preserved because it’s useful for survival.
“Just as genes propagate themselves in the gene pool by leaping from body to body via sperms or eggs, so memes propagate themselves in the meme pool by leaping from brain to brain via a process which, in the broad sense, can be called imitation.” — Richard Dawkins, The Selfish Gene (1976), ch. 11, “Memes: the new replicators.” [verified: https://colinallen.dnsalias.org/Courses/2004-2005_Fall/X755/Readings/dawkins-memes.html] Why: The hinge of the chapter: selection moves from bodies to ideas, behaviors and ways of being.
“The falseness of an opinion is not for us any objection to it… The question is, how far an opinion is life-furthering, life-preserving, species-preserving, perhaps species-rearing.” — Friedrich Nietzsche, Beyond Good and Evil (1886), §4, trans. Helen Zimmern. [verified: https://www.gutenberg.org/cache/epub/4363/pg4363.txt] Why: Pulls apart “does this belief help it survive?” and “is it true?”, which is the chapter’s key question.
“Other things being equal, population memetics predicts that conspiracy theory memes will persist quite independently of their truth, and the meme for faith is apt to secure its own survival, and that of the religious memes that ride piggyback on it, in even the most rationalistic environments.” — Daniel C. Dennett, Consciousness Explained (1991). [verified: https://en.wikiquote.org/wiki/Daniel_Dennett] Why: The practical warning against being cheated: some ideas survive because they block the checks that would expose them, not because they’re true.

Research

Core argument

Start below thought. A bacterium swimming up a sugar gradient and tumbling away from acid already sorts the world into toward and away. Nobody taught it; ancestors that sorted badly left fewer descendants. “Good” starts as what keeps this pattern going and “bad” as what ends it (Spinoza’s conatus, already in the Quote options).
Valence is a fast, cheap summary, not a truth report. Pleasure, pain, disgust and craving are verdicts that evolution compressed ahead of time. They were tuned for ancestral conditions and make predictable errors: the Garcia rat that avoids sweet water because it got sick later, the craving for sugar in a world full of it, Berridge’s gap between wanting and liking.
Social animals add a second layer. Once survival depends on the group, “good” grows to cover what keeps the group together: sharing, fairness, loyalty, punishing cheats. Darwin argued any strongly social animal with enough intellect would come to have a conscience (Descent of Man, ch. IV).
Humans add a third layer: the information world (Ch. 6). Ideas, habits, rituals and ways of being can now be copied from mind to mind. Anything that varies, gets copied, and gets copied at different rates will evolve (Lewontin’s recipe, Dawkins’s memes). So values now compete like organisms, with their own “fitness.”
The pivot: what makes an idea spread is not the same as what makes it true, or good for its hosts. Some survive because they help their carriers (cassava processing, handwashing). Some survive because they are good at being copied (outrage, novelty, chain letters, “share this or else”). Some survive by disabling the checks that would kill them (“doubt is the devil talking”).
Culture can be wiser than its carriers. Henrich’s cassava case shows a practice that protects people who cannot say why it works. So “I don’t know why we do this” does not prove a practice is foolish. Fence-mending humility cuts both ways.
Culture can also be ahead of its carriers in the wrong direction. Foot binding, funerary practices that spread kuru, and the doctors who mocked Semmelweis show harmful or false ideas outcompeting better ones for generations.
The trouble with both. Our sense of good and bad is inherited twice, once from genes and once from culture, and neither inheritance was selected for truth. It was selected for persistence. Feeling that something is right is evidence that it survived, not that it is correct.
The practical tool: for any belief, ask two separate questions. Is it true? and Why is it still here? (Who benefits from it spreading? What does it make you do to pass it on? What does it say about people who doubt it?) Being cheated usually happens in the gap between those answers.
Limit and handoff. Survival explains where values come from. It does not settle which ones we should keep (Foot, and Hume’s is/ought gap). Tee up Ch. 8 (is good/bad really a clean cut?) and Ch. 9 (what cutting this way costs us).

Key questions

Does a bacterium “prefer” anything? If not, when does preference begin: nerves, feelings, or language?
Is pain bad, or just information that tends to feel bad? What about people born unable to feel pain (congenital insensitivity to pain), who often die young?
If sugar felt good because it was scarce, what are our other “good” feelings still calibrated for?
Can something feel good and be bad for you, and feel bad and be good? Where is “good” actually located?
Why does a rat need only one bad night to hate a flavor forever, when it needs dozens of trials to learn a light predicts food?
When a wolf pack shares a kill, is that “fairness” or just what worked?
If ideas evolve, what is an idea’s “body,” its “offspring,” its “predator”?
Does an idea care whether it is true? What would it mean for an idea to be “selfish”?
Why did false news on Twitter outrun true news? Is the fault in the stories, the platform, or us?
Why might a belief survive better after its prophecy fails (Millerites, Seekers)?
What is the difference between a practice being useful and being true? Can a false belief carry a useful practice (“wash to drive out the spirits”)?
If a tradition keeps you alive and you don’t know why, should you keep it? How would you ever find out?
Which of my values did I choose, which did I inherit from my family, and which from my feed?
A child asks: “Who decided lying is bad?” What is the most honest answer?
A cynic asks: “If morals are just ideas that won, isn’t ‘good’ just a word for ‘winning’?” What does the chapter say back?
If costly religions last longer, does that make them truer, or just stickier?
What does a belief say about people who question it? Why is that a warning sign?
Could we deliberately design ideas that are both true and good at spreading? (Science as a culture that rewards killing ideas.)
If my disgust at something is inherited, how would I tell whether it is protecting me or just policing others?
Are there values that survive because they are true, and would that be the exception or the rule?

Examples

E. coli run and tumble (cells). A bacterium swims straight while conditions improve and tumbles randomly when they get worse, a memory about 4 seconds long that lets it climb food gradients. Good and bad as a steering rule, with no mind involved. (Howard Berg, E. coli in Motion, 2004. Wikipedia: https://en.wikipedia.org/wiki/Chemotaxis)
Paramecium’s avoiding reaction. It bumps into something, reverses its cilia, backs up, turns and tries again. It is a single cell with a built-in “no.”
The Garcia effect (animals, 1950s–1966). John Garcia gave rats sweetened water and then irradiated them hours later. The rats came to avoid the sweet water after a single pairing, even though the sickness arrived long after the taste. Evolution had pre-shaped which “bads” are easy to learn. (https://en.wikipedia.org/wiki/Conditioned_taste_aversion). A human version: the dish you ate before a stomach flu that you still can’t face.
Wanting vs. liking (brains). Berridge’s rats show that dopamine manipulation changes how hard they work for sugar without changing how much they “like” it (facial reactions). A strong pull is not proof that something is good for you. (Berridge 2009, already in furtherReading.)
Sugar and the mismatch. Sweet meant ripe, safe calories for most of primate history. Put the same valence in a supermarket and it becomes a trap. Evolution’s “good” has a sell-by date.
Lactase persistence (gene-culture loop). Dairying (a cultural practice) made milk-digesting genes advantageous. Frequencies run from about 15–54% in south-east Europe to 89–96% in the north-west. A cultural “good” changed the gene pool. (https://en.wikipedia.org/wiki/Lactase_persistence)
Cassava processing (culture wiser than its carriers). In Amazonian groups, bitter manioc goes through long, laborious soaking, grating and cooking that removes cyanogenic compounds. People doing it often can’t explain why, and shortcuts cause chronic poisoning (konzo). Henrich uses this to argue that cultural evolution builds adaptive practices no individual designed. (Henrich, The Secret of Our Success, 2015, ch. 7. Check the chapter number against the edition.)
Kuru among the Fore (a costly practice). Funerary cannibalism in Papua New Guinea spread a fatal prion disease. Around 1957 about 200 people died of it each year. The practice had meaning and survived for social and spiritual reasons while killing its carriers. It declined after an administrative ban around 1960, before the cause was understood. (https://en.wikipedia.org/wiki/Kuru_(disease))
Semmelweis (a true idea losing). In 1847 at the Vienna General Hospital, chlorinated-lime handwashing cut maternal mortality from about 18% to under 2%. Doctors took offense and mocked him, and the practice didn’t spread for decades. Truth alone doesn’t win; it has to also be copyable and not insulting to the people who would have to copy it. (https://en.wikipedia.org/wiki/Ignaz_Semmelweis)
The Millerites, 22 October 1844, and the Seekers, 21 December 1954. Both predicted an apocalypse that didn’t come. Many believers doubled down rather than quitting: the Millerite movement fed into Seventh-day Adventism, and Festinger, Riecken and Schachter documented the Seekers’ proselytizing increasing after the failure (When Prophecy Fails, 1956). A belief can survive refutation if it has already captured identity. (https://en.wikipedia.org/wiki/When_Prophecy_Fails, https://en.wikipedia.org/wiki/Great_Disappointment)
The Shakers (a value that couldn’t reproduce itself). A celibate communal movement that peaked at 2,000–4,000 members in 18 communities in the mid-1800s. They relied on converts and adoptees, and when recruitment dried up the movement nearly vanished. Its idea of “good” limited its own transmission. (https://en.wikipedia.org/wiki/Shakers)
Costly commune rules (groups). Richard Sosis’s studies of 19th-century American communes found that communes with more costly requirements tended to last longer, and religious communes outlasted secular ones. A demanding value can be “fit” precisely because it is costly. (Sosis & Bressler 2003, Cross-Cultural Research 37(2). Verify the exact numbers before quoting any.)
False news on Twitter, 2006–2017 (civilizations/media). Vosoughi, Roy & Aral studied about 126,000 stories: falsehood spread “farther, faster, deeper, and more broadly,” it was more novel, and bots didn’t explain the gap. People did. (Science 359:1146, 2018, doi:10.1126/science.aap9559)
The Werther effect. Goethe’s 1774 novel was blamed for copycat suicides. David Phillips (1974, American Sociological Review 39:340) found US suicides rose after front-page suicide stories. A behavior spreading by imitation, regardless of its value to the imitator.
Foot binding ending (a value dying fast). It peaked in the mid-to-late 19th century and collapsed within roughly a generation in the early 20th century. Gerry Mackie (1996, American Sociological Review) argues it fell because anti-binding societies made families pledge together, which changed the marriage market all at once. Values can be dislodged by changing what makes them spread, not just by arguing that they’re wrong. (https://en.wikipedia.org/wiki/Foot_binding)
Thought experiment: the chain letter. “Send this to 10 people or bad luck will follow.” The message has no content except instructions for copying itself, plus a threat against anyone who breaks the chain. It is the purest selfish idea and a template for spotting the same shape in bigger beliefs.

Source material

“any animal whatever, endowed with well-marked social instincts … would inevitably acquire a moral sense or conscience, as soon as its intellectual powers had become as well, or nearly as well developed, as in man.” Charles Darwin, The Descent of Man (1871; 2nd ed. 1874), ch. IV, “Comparison of the Mental Powers of Man and the Lower Animals, continued.” The ellipsis removes a long parenthetical footnote about the parental and filial affections. [verified: https://www.gutenberg.org/cache/epub/2300/pg2300.txt] Use: This is the bridge from survival to morality: conscience as what a social survivor grows once it can think.
“the judgment “good” did not originate among those to whom goodness was shown. Much rather has it been the good themselves, that is, the aristocratic, the powerful, the high-stationed, the high-minded, who have felt that they themselves were good” Friedrich Nietzsche, The Genealogy of Morals (1887), First Essay, §2, Levy edition (Gutenberg ebook #52319, whose header lists “Translator: J. M. Kennedy”. The Levy Genealogy is usually credited to Horace B. Samuel, so confirm the translator before printing). [verified: https://www.gutenberg.org/cache/epub/52319/pg52319.txt] Use: Asks who a value served when it spread. This is a different Nietzsche text from the BGE quote already listed.
“The irritation of doubt causes a struggle to attain a state of belief.” C. S. Peirce, “The Fixation of Belief,” Popular Science Monthly 12 (Nov. 1877), §IV. [verified: https://www.peirce.org/writings/p107.html] Use: Belief as a comfort-seeking state. We are motivated to stop doubting, which isn’t the same as being motivated to be right.
“When an ostrich buries its head in the sand as danger approaches, it very likely takes the happiest course. … But this method of fixing belief, which may be called the method of tenacity, will be unable to hold its ground in practice. The social impulse is against it.” C. S. Peirce, “The Fixation of Belief” (1877), §V. The two sentences are not adjacent; the ellipsis marks the gap. [verified: https://www.peirce.org/writings/p107.html] Use: Peirce ranks ways beliefs survive (tenacity, authority, a priori, science). That fits “why does this belief survive?” directly.
“Falsehood flies, and truth comes limping after it, so that when men come to be undeceived, it is too late; the jest is over, and the tale hath had its effect” Jonathan Swift, The Examiner No. XIV (9 November 1710). [verified: https://en.wikiquote.org/wiki/Jonathan_Swift] (Wikiquote, a secondary source; check a facsimile if possible.) Use: A 300-year-old intuition that pairs with the 2018 data below.
“Falsehood diffused significantly farther, faster, deeper, and more broadly than the truth in all categories of information” Soroush Vosoughi, Deb Roy & Sinan Aral, “The spread of true and false news online,” Science 359(6380):1146–1151 (2018), abstract. [verified: https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=DOI:10.1126/science.aap9559&resultType=core&format=json] Use: Hard evidence that fitness in the information world and truth come apart. The abstract also says “false news was more novel than true news.”
“Morality binds and blinds. It binds us into ideological teams that fight each other as though the fate of the world depended on our side winning each battle. It blinds us to the fact that each team is composed of good people who have something important to say.” Jonathan Haidt, The Righteous Mind (2012), p. 366 (per Wikiquote). [verified: https://en.wikiquote.org/wiki/Jonathan_Haidt] (secondary; check the page against the Pantheon edition) Use: Moral values as group-survival technology, and the cost: the same thing that binds a group blinds it.
“Dirt is essentially disorder.” Mary Douglas, Purity and Danger (1966), Introduction (p. 2 in Routledge Classics eds.). [UNVERIFIED] I couldn’t reach the text; check it against a print copy. Use: Shows that “bad” (dirty, polluting) often marks a broken category rather than a real danger. Bridges to Ch. 8 and Ch. 10.

Also consider (no quote pulled): Henrich 2015 on cassava; Dennett, Darwin’s Dangerous Idea (1995) on memes and “universal acid”; Jablonka & Lamb, Evolution in Four Dimensions (2005) on the behavioral and symbolic inheritance systems; Lewontin, “The Units of Selection” (1970), for the three conditions (variation, differential fitness, heritable fitness); Philippa Foot, Natural Goodness (2001), as the counterweight.

Counterarguments and limits

Is/ought (Hume, Moore’s naturalistic fallacy). Showing that a value survived doesn’t show we should hold it. The chapter has to be explicit: survival explains origins, and it doesn’t justify. Foot actually argues the other way, that “natural goodness” is a real normative standard for living things. Cite her so the author isn’t strawmanning.
The genetic fallacy. A belief’s origin doesn’t settle whether it’s true. Mathematics spread partly for status and trade reasons and is still true. “Why does it survive?” should prompt a check, not replace one.
Meme theory is contested. Critics (Sperber’s “epidemiology of representations,” Atran, Boyd & Richerson) argue that ideas aren’t copied with high fidelity like genes. They are reconstructed in each mind and pulled toward “attractors.” So “ideas compete like organisms” is an analogy with limits. There are no clear units and no clean lineages. Present it as a lens, not a mechanism.
Adaptationist overreach. Not every value is an adaptation. Some are by-products, drift, or historical accident. Don’t tell just-so stories about why a custom “must” have helped.
The cynicism trap. If all values are just survivors, the reader’s own reasoning is too, and the argument undercuts itself. The answer is that some cultural practices, like science and courts with evidence rules, are built to select for truth. That’s the hopeful move, and it hands off to Act III.
Valence isn’t only survival. People go on hunger strike, die for strangers, and value art that has no fitness payoff. The chapter’s earlier draft rightly says significance isn’t pleasure. Don’t reduce all “good” to “keeps me alive.”
Factual caution. Sosis’s commune numbers, Henrich’s cassava details and the Werther data are often quoted loosely. Check the primary sources before using any specific numbers.

Connections

Ch. 1 (Before Thought, There Is Want): wanting is the engine; here, wanting gets a direction, toward or away.
Ch. 2 (Will Creates Difference): competing wants among organisms; here, competing values among ideas. Sapolsky’s layers include culture.
Ch. 3 (Love, Growth, and Meaning): care as a value that survives because it takes in others. A good test case for “survives and good.”
Ch. 4 (From Subjectivity…): our feelings of right and wrong are filters too, and the chapter’s “measured self-doubt” applies to moral intuitions.
Ch. 5 and 6 (First and Second Blades): there has to be a self to be good for (Ch. 5) and an information world to carry culture (Ch. 6) before ideas can compete. The third blade needs both.
Ch. 8 (What Is Not a Cut?): test whether good/bad is really a pair or a continuum, whether there is anything neutral, and whether disgust tracks real danger (Douglas).
Ch. 9 (The Cost of the Blade): measures replacing purposes are memes that outcompete the goals they stood for (Goodhart/Strathern).
Ch. 16 (Marvel, Meander, Manifest): the landscape of outcomes. The toward/away slope introduced here becomes a practice: facing a feared outcome lowers its hill through learning, and picturing the climb keeps hope tied to conditions.
Ch. 10 (Thingification): “Good” and “Evil” as things rather than directions.
Ch. 11 (Knowledge): epistemology as a set of cultural practices designed to make truth fitter than falsehood; Peirce’s four methods.
Act III cycles: cultural evolution as one of the loops (variation, selection, retention).

Exercise ideas

Two-column belief audit.
- Instruction: Pick three beliefs you hold firmly: one moral, one about health or food, one about politics or a group. For each, write two columns. Left: “Why I think it’s true” (evidence I’ve actually seen). Right: “Why it survives in me” (who gave it to me, what holding it gets me, what I’d lose by dropping it, what it says about people who disagree).
- Notice: Which column is longer? Did any belief have a full right column and a thin left one? Did any belief say doubters are bad, stupid or dangerous?
- Why: This is the chapter’s core move made concrete: whether a belief is true and why it survives are separate questions.
Trace one viral message.
- Instruction: Find one message that spread widely this week (a forwarded warning, a trending claim, a family WhatsApp chain). Write down (a) what it makes you feel, (b) what it asks you to do, especially to share it, (c) whether it’s true, checked against a primary source, and (d) who benefits if it spreads.
- Notice: How much of the message is about the world and how much is about getting passed on. Were the answers to (a) and (b) doing more work than (c)?
- Why: It shows ideas competing like organisms, in real time, using the Vosoughi result as a lens.
The inherited flinch.
- Instruction: List three things that give you an instant “yuck” or “wrong” reaction: a food, a behavior, a type of person or choice. For each, ask whether it harms anyone if you’re right and it’s bad, where you first learned it, and whether people in another culture or century would flinch too.
- Notice: Which flinches track real danger (spoiled milk) and which track “out of place” (Douglas)? How does it feel to look at a flinch without obeying it?
- Why: It shows the two inheritances of good and bad, biological and cultural, and that a feeling of wrongness is evidence of survival, not proof.

Open questions for the author

Does the chapter endorse meme theory or use it only as a metaphor? Dawkins is already in the Quote options. Should Sperber’s critique appear in the text or only in a note?
How far will you go into “the trouble with both”? Is the claim that all inherited values are suspect, or only that they must be checked? Pick one hopeful counterexample (science, courts, apology, care) to keep the chapter from reading as pure debunking.
Keep the spoiled-milk opening from the earlier draft, or open with the bacterium to make “simpler life forms” literal?
Where does Foot’s natural goodness sit: as a foil, or as partial support for “good starts as flourishing”?
Should religion be named as a main example (the Quote options’ Dennett line already does), or should the chapter use neutral cases (the Millerites, chain letters) to avoid reading as an attack? The outline’s goal (“not being cheated by religions”) suggests naming it, but tone matters.
Is “value” (the chapter’s theme tags) the same as “good/bad,” or do you want a distinction between valence (felt), value (held), and morality (shared rules)?
The Berridge and “Before the explanation arrives” practice belongs more to Ch. 1’s wanting. Move it there, or keep it as the chapter’s first step?

Reader perspectives

Curious young child

First reactions:

The sour-milk opening is perfect. “BLEURGH” is a face every kid has made. “Your face has made a sentence” is a line they’d repeat.
“Good is yummy and bad is yucky” is their first theory. Then immediately: “But broccoli is yucky and it’s GOOD for you. And candy is yummy and it’s BAD. That’s backwards!” This is the chapter’s real question, and a child arrives at it in ten seconds.
“Ideas surviving” sounds weird and cool: “Ideas are ALIVE?” They’d imagine ideas as little creatures running from head to head.
The idea of cultures deciding good and bad would bother them, because at home good and bad come from Mum and the teacher.
“Valence” is a word they’d skip.

Questions they’d ask:

“Why does candy taste good if it’s bad for my teeth? Is my tongue lying to me?”
“Do plants think things are good or bad? Does a sunflower LIKE the sun?”
“Does a worm know it’s bad to be stepped on?”
“Why is it bad to hit my brother but okay for a lion to eat a zebra?”
“If everybody at school says something, does that make it true?”
“How can an idea ‘survive’? Does it eat? Does it have babies?”
“Why does everybody at school know ‘step on a crack, break your mother’s back’ when nobody’s mum’s back ever broke?”
“Who decided what’s good? God? The teacher? The first person ever?”
“Why do I want the iPad even when it makes me grumpy after?” (Berridge’s wanting versus liking, in kid form)
“If a bad idea keeps winning, does it become good?”
“Is Santa an idea that survives? Why do grown-ups keep it going?”
“Why do my grandma and my mum think different things are rude?”

Where they’d get lost, bored, offended or unconvinced:

The brief’s key move, from survival of bodies to survival of ideas, isn’t in the earlier draft. The draft stays on feelings, wanting and liking, and dinner plans, and never gets to ideas competing like animals. A kid would find that the most exciting part, and it’s missing.
The dinner paragraph (ease, recognition, a quiet room, affordability) is a grown-up restaurant problem. Boring.
“Consent-based,” “obligations,” “moral judgment requires further reasons”: this is lecture tone.
Dennett’s quote about conspiracy theories and “the meme for faith” could upset a religious kid, or their parent reading along. If faith is used as the example, it needs care, or it will feel like the book is picking on their family.
Nietzsche’s “the falseness of an opinion is not for us any objection to it” would sound to a child like permission to lie. The chapter must show that the point is the opposite: notice why a lie survives.
Unconvinced moment: the wolf-and-company-and-argument paragraph. “A wolf isn’t being mean, it’s hungry.” They’d defend the wolf. That’s a good instinct to build on.

Examples they’d bring:

Playground rhymes and superstitions: “step on a crack,” cooties, “cross your fingers and it doesn’t count.” Iona and Peter Opie documented that children pass such rhymes and games to each other across generations, largely without adults (The Lore and Language of Schoolchildren, 1959). That’s a real, kid-owned case of ideas surviving because they’re fun and catchy, not true.
Chain messages: “Send this to 10 people or you’ll have bad luck.” The idea survives by scaring you, which is exactly the “why does it survive versus is it true” test.
Broccoli versus candy: body-good and tongue-good come apart. Great for “an urge is not a verdict.”
Spitting out a berry: animals and babies spitting out bitter things is a real survival shortcut. Bitter often signals poison, even though some bitter things are fine.
Family rules that differ: shoes on in the house at one friend’s, off at another’s. “Good” changes by house, which shows culture making good and bad.
The class hamster or a pet that won’t eat something: the pet has its own good and bad, and they aren’t ours.

What would win them over:

The “ideas are alive” picture made vivid: ideas jump from head to head like head lice. That’s gross and memorable, and it’s the Dawkins meme quote in kid language.
A “Why is it still around?” game: take a playground rhyme or a superstition, ask whether it’s true, then ask why everyone knows it. Two different answers.
Honesty that yummy and good-for-you are different, and that grown-ups struggle with that too (the chips, the phone).
Letting the kid be right that the wolf isn’t evil.

Cynical adult

First reactions:

“Good and bad began as survival” is evolutionary psychology’s favorite move, and it’s also Jordan Peterson’s lobster chapter in 12 Rules for Life (2018). I’ve watched this argument get used to justify hierarchies. I’m on guard.
The key question in the brief, “why does a belief survive, separately from whether it’s true?”, is genuinely useful. It’s the best tool in Act II. The draft barely gets to it.
The draft is about valence (sour milk, wanting versus liking), while the brief is about the survival of ideas. They’re two different chapters, and only the first one was written.
Memes, Dawkins, Dennett: I thought memetics fizzled as a science. Is the book leaning on a discredited framework without saying so?
The Nietzsche quotation (falseness is no objection) is provocative, and it could easily be read as the book endorsing it.

Questions they’d ask:

If good is what helps survival, is a successful con artist good? The draft half-answers with the wolf and the company. Say it straight.
Isn’t grounding values in survival the naturalistic fallacy? Hume and G. E. Moore flagged this. Does the book know that?
Memetics never became a working science; the Journal of Memetics stopped publishing in 2005. Why should I trust a meme-based account of values?
“Values compete like organisms.” What’s the unit, what’s the fitness, what’s the reproduction? Or is this a metaphor I’m meant to feel rather than test?
Which of my beliefs survive for reasons other than truth? Don’t just point at religion and conspiracy theories; that’s the easy target.
Doesn’t this argument eat itself? If beliefs survive for non-truth reasons, why should this book’s beliefs be any different?
The Dennett quote singles out faith. Is the book anti-religion? If so, say so. If not, why pick that quote?
Berridge’s wanting versus liking is neuroscience. How far does it actually generalize to “justice” and “apology”? It sounds like a lab finding stretched over ethics.
The dinner-plan paragraph says “good” emerges from needs and histories. Is that relativism? If not, where’s the floor?
Who gets to say which surviving ideas are the bad ones? That’s exactly what every propagandist claims to know.
What’s the practical upshot? A checklist for spotting a belief that survives by blocking its own tests?

Where they’d get lost, bored, offended or unconvinced:

The sour-milk opening is vivid but trivial. Everyone knows disgust is fast.
“An urge is not a verdict… it is not an order from the universe.” Who thinks it is? Straw man.
“A single ‘I want’ can turn out to be a crowded room.” Nice line. I’ve heard it on podcasts.
The draft never does the thing the brief promises: follow an idea or behavior that outlived its usefulness or its truth and show why it survived. Without that, the survival-of-ideas claim is an assertion.
I’d be put off by any hint that “surviving” makes a value legitimate. The draft’s “practical fit does not settle morality” helps, but it should be the chapter’s spine, not one paragraph.
The practice (“Before the explanation arrives”) is introspection homework again. I’d want an exercise pointed outward, at a claim someone is selling me.

Examples they’d bring:

Chain letters and chain emails (“forward to ten people or bad luck”): pure survival engineering with no truth content. The text is built to be copied. The cleanest possible case of the chapter’s question.
Multi-level marketing pitches. The beliefs (“you’re your own boss”, “passive income”) spread because recruits have to recruit, not because they’re true. The US Federal Trade Commission’s business guidance on MLMs discusses how most participants earn little or nothing.
“Breakfast is the most important meal of the day.” A belief that spread with help from cereal marketing. Show that its persistence has a commercial history, separate from what the nutrition evidence says, and be careful not to overclaim either way.
Workplace culture. “Always be available” survives in an office because it signals loyalty, not because it improves the work. A value competing and winning for the wrong reason, in my own life.
Superstitions in sport: lucky socks, playoff beards. Harmless, sticky, and a good low-stakes way to show survival without truth before tackling sharper examples.
Food taboos and pork. Marvin Harris’s ecological explanation of pork avoidance (Cows, Pigs, Wars, and Witches, 1974) is a real, contested attempt to explain a value by its survival function. Useful precisely because it’s contested.

What would win them over:

Put the naturalistic fallacy up front and show how the chapter avoids it: survival explains why values exist, not why they’re right.
Two columns, “why this belief spreads” and “whether it’s true,” applied to at least one belief the reader probably holds, not only to the believers the reader already looks down on.
Honesty about memetics: use it as an analogy, say it failed as a formal science, and say why the analogy still earns its place.
Turn it on the book: “this book’s ideas also compete to survive; here’s how to check whether they deserve to.”

Believer / spiritual reader

First reactions:

“The third blade: good and bad.” For anyone raised on Genesis this is the tree of the knowledge of good and evil (Genesis 2:17), and the serpent’s promise, “ye shall be as gods, knowing good and evil” (Genesis 3:5, KJV). The book’s own title, Unnatural, sits right on top of the Fall story. If the chapter doesn’t acknowledge that, it will look naive.
Dennett’s quote about “the meme for faith” surviving in rationalist environments is where many religious readers will put the book down. It is on the quote list for the chapter that defines good and bad, so it implies faith is the example of a belief that survives without being true.
The milk-tasting opening is good, and familiar to Buddhist readers as vedanā: the pleasant, unpleasant or neutral feeling-tone that arises before thought. Buddhism made this the second link in dependent origination and built a whole practice around watching it.
They’d welcome the draft’s line that “the third blade… cannot finish ethics by itself.” Most traditions agree that feeling is not morality.
“Good begins as survival” will read as reductionism. Theists will point to Genesis 1:31, where God calls creation “very good” before anything has to survive.

Questions they’d ask:

If good and bad begin as survival, is martyrdom simply bad? The chapter needs an answer for people who chose death over betraying what they believed good. Is that the survival of an idea at the expense of its host, and is that all it is?
Nietzsche says falseness is “no objection” to a belief if it’s life-preserving. Do you agree? If not, why quote him without pushing back?
Your key question is “why does a belief survive, apart from whether it’s true?” Will you ask it of secular beliefs too, like progress, the market, or the autonomous self? Or only of religious ones?
Gamaliel in Acts 5:38–39 said, “if this counsel or this work be of men, it will come to nought: But if it be of God, ye cannot overthrow it.” He used survival as a sign of truth. Your chapter says survival and truth come apart. Can you engage him directly? It’s a perfect foil.
The Buddha’s Kalama Sutta (Anguttara Nikaya 3.65) tells people not to accept teachings on tradition, scripture or a teacher’s authority, but to test whether they lead to harm or welfare. Isn’t that your “don’t be cheated” principle, taught by a religious founder?
Where does evil come from in your picture? Augustine said evil is a privation, an absence of good, not a substance (Enchiridion, ch. 11). Is “bad” in your book a thing or a lack?
You separate wanting from liking (Berridge). The desert fathers, and Buddhist teaching on taṇhā (craving), made this distinction the centre of spiritual life. Will you say so?
Can a value be true, not just adaptive? If “do not murder” survives because it helps groups survive, is it only that?
Why does the Bhagavad Gita (2.38) tell Arjuna to treat “pleasure and pain, gain and loss, victory and defeat” alike? Is equanimity a way of putting the third blade down? Does the book think that’s possible or wise?
Isaiah 5:20: “Woe unto them that call evil good, and good evil.” Do you think that warning is meaningless, or is there a fact it’s tracking?
If ideas compete like organisms, what is the fitness landscape for compassion? Why has loving your enemy survived at all?

Where they’d get lost, bored, offended or unconvinced:

Offended: The Dennett quote, and more generally the brief’s framing that the survival-versus-truth question is “central to not being cheated,” in a book whose goal names religions as cheats. The reader will feel the whole chapter is aimed at them. If Dennett stays, give a religious or religion-sympathetic voice the same space, or turn the question on a secular belief first.
Unconvinced: The step from “survival in simple organisms” to “survival of ideas.” Memetics is contested even among secular scholars. A believer will notice that the argument is by analogy, and will say analogy is exactly what the book warns against elsewhere.
Unconvinced: “Moral judgment requires further reasons: who bears the harm, whether a choice is free…” Where do those further reasons get their authority? That is the religious reader’s home question, and the draft hurries past it.
Lost: “Valence” is jargon. The reader has words for this already: vedanā, the passions, the nafs, desire. Offer one.
Bored: The dinner-plan example. It is too small for a chapter titled “Good, Bad, and the Trouble with Both.” They’d want a real moral stake.

Examples they’d bring:

Genesis 2–3, the tree of the knowledge of good and evil: the oldest story in the West about acquiring the third blade, and it frames that acquisition as a loss of innocence and a cost. It maps directly onto Chapter 9 and the book’s title.
The Kalama Sutta (AN 3.65): the Buddha tells villagers confused by rival teachers to judge teachings by whether, when practised, they lead to harm and suffering or to welfare and happiness. That is a survival-and-consequence test for beliefs, from inside a religion.
The Buddhist feeling-tones (vedanā): pleasant, unpleasant, and neutral. That is a third option the chapter’s binary doesn’t have, and it would enrich “good, bad, and the trouble with both.”
Matthew 7:16, “Ye shall know them by their fruits”: the Christian test of a teacher by consequences. It sits near the chapter’s argument but isn’t the same as survival, so it’s useful for showing the difference between “it lasts” and “it bears good fruit.”
Martyrs such as Maximilian Kolbe (Auschwitz, 1941), who volunteered to die in another prisoner’s place: a hard case that survival-based value has to explain, or admit it can’t.

What would win them over:

Apply the survival-versus-truth question evenly: first to a secular belief (a political ideology, a consumer myth), then to a religious one. And admit that some religious traditions taught this very question (Kalama, “by their fruits”).
Name the Genesis tree. The chapter’s metaphor is the Fall’s metaphor, and saying so will make a religious reader lean in rather than bristle.
Leave room for the claim that some goods are true and not merely adaptive, even if the book doesn’t adopt it. Philippa Foot is already on the further-reading list; lean on her more.
Replace or balance the Dennett quote. In a chapter about the origins of value, it reads like a verdict against faith, not an argument.

Skeptical scientist

First reactions:

“Good and bad beginning as survival” gets the biology slightly wrong. Selection acts on differential reproduction and gene propagation, not survival. A salmon that dies after spawning, a male mantis eaten by its mate, and a worker bee dying for its colony are all “good” by selection’s count. The distinction matters here because it’s exactly where organism-level good and replicator-level good come apart, and that’s the chapter’s own thesis about ideas.
The memetics framing (Dawkins, Dennett) is rhetorically strong and scientifically contested. Most cultural evolution researchers moved to population models without discrete “memes”: Boyd & Richerson’s Not by Genes Alone (2005) and Sperber’s cultural attraction. The chapter can make its point (“why a belief survives is separate from whether it’s true”) without committing to memes as units.
The Berridge wanting/liking material is the strongest science in the draft and properly used. Extend it rather than adding more philosophy.
There’s a jump from valence (a creature’s approach/avoid signal) to values competing like organisms. The draft never builds that bridge. The link is transmission biases, and those have been measured.

Questions they’d ask:

Do you mean survival, or reproductive success? Those rank traits differently.
At what level is something “good”: the gene, the organism, the group, or the idea? Multilevel selection is still argued over. Are you taking a side?
Does a nematode have valence in the sense you mean, or only approach/avoid reflexes? Where would you draw that line, and on what evidence?
If dopamine-depleted rats still show “liking” facial reactions to sugar but stop working for it (Berridge & Robinson 1998, Brain Research Reviews, “What is the role of dopamine in reward”), which of those is the “good”?
How do reward prediction errors (Schultz, Dayan & Montague 1997, Science, “A neural substrate of prediction and reward”) fit your picture? Is “good” a state, or a surprise relative to expectation?
What makes one idea spread more than another? Is there data rather than analogy?
If false news spreads faster than true news, what exactly is being selected for?
When a parasite changes its host’s valence, whose good is being served?
Is the claim that values compete “like organisms” meant as literal Darwinian dynamics (variation, heritability, differential fitness) or as a metaphor? What would falsify it?
Doesn’t the naturalistic fallacy (and Foot’s own argument in Natural Goodness) block moving from “survives” to “good”? The draft half-concedes this. Is the brief consistent with it?

Where they’d get lost, bored, offended or unconvinced:

The sour-milk opening is good, but it’s disgust and taste aversion, which have their own literature. Use it.
“A wolf hunting well, a company extracting efficiently…” puts three very different selection processes in one sentence. A biologist will object to “adapting” being used for all three.
The dinner-plan paragraph (“one wants ease, one wants to be recognized…”) is social psychology with no evidence. It’s fine as an illustration, but it adds nothing the brief needs about survival of ideas.
The brief’s promise (“values compete like organisms”) doesn’t appear in the earlier draft at all. The reader who came for that argument gets a chapter on personal affect.

Examples they’d bring:

Conditioned taste aversion (Garcia & Koelling 1966, Psychonomic Science, “Relation of cue to consequence in avoidance learning”). Rats readily link taste to later nausea, but not light or sound to nausea. Valence is biased in advance by evolutionary history, which is the sour-milk moment made rigorous.
Disgust as a system: Rozin & Fallon 1987, Psychological Review, “A perspective on disgust”. It traces how a food-rejection response extends to moral and social disgust, which is the chapter’s arc from survival to culture inside one emotion.
Toxoplasma and rats (Berdoy, Webster & Macdonald 2000, Proceedings of the Royal Society B, “Fatal attraction in rats infected with Toxoplasma gondii”). Infected rats lose aversion to cat odour. What’s good for the parasite rewrites the host’s bad. It’s the biological twin of a belief that spreads by harming its holder.
False news on Twitter (Vosoughi, Roy & Aral 2018, Science, “The spread of true and false news online”). False stories spread farther, faster and more broadly than true ones, largely through humans rather than bots, and were rated more novel. This is survival separate from truth, with data.
Cassava (manioc) processing: lengthy detoxification practices kept in cultures that couldn’t explain them in chemical terms (Joseph Henrich, The Secret of Our Success, 2016). A case where a practice survives because it’s useful though its stated reasons are not the real ones. It’s the flip side of the Vosoughi finding.
Evolutionary mismatch: a sweet preference that was adaptive under scarcity and is harmful under abundance. “Good” is always good relative to an environment.

What would win them over:

Replacing “survival” with “differential persistence and reproduction,” and saying once why the difference matters.
Explicit mechanisms for why ideas spread (content, prestige and conformity biases; novelty; emotional arousal), each with a named study, instead of a meme metaphor alone.
A clear firewall: the chapter explains why values persist and says outright that this doesn’t tell you which ones are right.
Keeping the Berridge material, expanded with the rat taste-reactivity evidence behind it.

Earlier draft

From “The Third Blade: Good, Bad, and the Trouble with Both”

You taste milk that has turned. Before you form a sentence, your face has made one. Pull away. Do not swallow. The world has arrived with a direction attached.

This is the third blade: the difference between what draws us closer and what sends us back. Pleasure and pain, comfort and alarm, attraction and aversion are part of how animals navigate. For this book, call that broad field valence: the way something lands as better, worse, safer, costly, welcome, or threatening for a creature in a situation.

It is tempting to make this sound cleaner than it is. An urge is not a verdict. Berridge’s distinction between wanting and liking helps here. You can reach for another episode, cigarette, or handful of chips with real force and enjoy it less than you expected. You can dread calling a friend and feel better after doing it. The first signal is information about your current orientation; it is not an order from the universe. Kurt Lewin pictured valence as a field of forces, and the picture helps as long as we remember it is one: the ground seems to slope toward some things and away from others, and we lean with it unless we choose otherwise. The dread before the call can weigh more than the call itself. Chapter 16 returns to what we can do with that weight when the outcome is out of our hands.

Nor does practical fit settle morality. A wolf hunting well, a company extracting efficiently, and a person winning an argument may each be adapting to something. None is thereby fair, kind, or consent-based. Moral judgment requires further reasons: who bears the harm, whether a choice is free, what promises exist, whether people have a voice. The third blade gives us a beginning for ethics because it tells us that things matter. It cannot finish ethics by itself.

That is why value so often becomes a quarrel. Two people can look at the same dinner plan and meet different stakes: one wants ease, one wants to be recognized, one needs a quiet room, one cannot afford the restaurant. “Good” is not simply painted onto the menu. It emerges from needs, histories, available options, and sometimes obligations to people not at the table.

A fair challenge is that some values seem to outrun feeling altogether. Justice may require a person to defend someone they dislike; grief may make a painful act the loving one. Exactly. Significance is not identical with pleasure. The person who sits through an uncomfortable apology is responding to a value that cannot be reduced to immediate comfort. Feeling can alert us to what is at stake; reflection and conversation can still revise the response.

Try Before the explanation arrives. Separate the pull, the feeling, the reason you give, the enjoyment that follows, and whether you would choose it again. An obligation or a fear may show up among those reasons. A single “I want” can turn out to be a crowded room.

As these orientations become shared, they harden into familiar oppositions: us and them, clean and dirty, success and failure. The next pages ask what happens when cuts begin to multiply.