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gwern comments on Evolutionary psychology: evolving three eyed monsters - Less Wrong
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The selfish gene could try not to waste resources raising children that are not possessing the gene. That works even better.
I think it is mostly learned what to be jealous about, possibly with some evolutionary assist that is nowhere as specific as jealousy, and has a lot of side effects. Furthermore, there are cultures where the host offers wives to strangers, as a form of hospitality. Possibly to breed more wives (I just came up with evo psych explanation for this on spot).
It's awful easy to rationalize any moral system evolutionarily, that's why it isn't good science.
http://en.wikipedia.org/wiki/Green-beard_effect
I'm not sure Green-beard effects can actually occur in practice since a mutation that kept the Green beard while destroying the pathway for self-altruism would out-compete the original Green beards.