The Origins and Psychology of Human Cooperation https://sci-hub.do/10.1146/annurev-psych-081920-042106 Gonna do the usual screencap highlights of half the paper

First, because some people are still unaware, it's generally accepted that kin and reciprocity altruism not enough to explain human ultrasociality
they try to pull some formulas not unlike Hamilton's r x b >c for more cultural forms of cooperation. My first instinct is to be skeptical, but apparently it predicts when cultural differences turn into 'it's ok to make a bit of a heckin' mass murder to that tribe, nbd really'
Also here
HAHAHA who is the second order free rider problem even real nigga just randomly assign someone to be a leviathan nigga just start a violence monopoly
One of the biggest downgrades from initial game theory genetics is that if it works just for genes 'going blind' should be seen easily in non-humans. Instead it's remarkably hard to force chimps to do the tit-for-tat cooperation they 'should' do and only culture makes it work
Ah, I see they do euphemisms of hajnal line, such as 'citing Joseph Henrich often' or 'exposure to the Catholic Church predicts lots of things' or 'with more kin based institutions you get less cooperation with strangers and more eagerness to punish them'
Relatedly, as someone with remarkably poor limb coordination that suffered in PE at school, I regret to inform you guys that one way to fill the god-shaped hole might be to have more dancing classes

(Or military marchers. Anything really, go wild with suggestions)
Plenty of studies centered around kids and their imitation of adults, with results highly dependent on the age tested, witnessed behavior of role models, and population. Goes as far as to suggest cooperative social norm learning is the main reason we have long childhoods!
(since I'm dumb and jumping around the thread, see how this is related, cultural evolution having faster shifts depending on other strategies makes it better suited for tit-for-tat evolving, still plenty of human cooperation it can't explain) https://twitter.com/SilverVVulpes/status/1345728579469012992
Also related to Fijian populations, it's pretty funny to see non-WEIRD populations closer to homo economicus style predictions in ultimatum games(same as with how everyone except westeners seems okay with cash gifts)
Population size you're used to grow up in seems important here
Related to this, a) authors are salty with cultural group selection skeptics, and believe within groups elective pressures are enough to explain pressures to do better in intergroup competition

and b) they give an... interesting list of examples of intergroup-compt strategies🧐
Lastly, they do have a good explanation of how "if one of us fails we're all screwed" environments can also lead to individual-level selective pressures that lead to altruistic-cooperative behaviors

(To make up for this, the self-domestication section is very meh😢)
My policy prescription is to create culture shocks at the most sensitive infantile period that create a shared group trauma, and thus get the sweet easy help at collective action problems due to shared perceived threat

Going by tumblr-adjacent discourse, we're doing great
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