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timtyler comments on People neglect small probability events - Less Wrong
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Not group, surely: kin. He quoted you as saying: "welfare (fitness) of kin".
I think you misinterpreted the context. I endorsed kin selection, together with discounting the welfare of non-kin. Someone (not me!) wishing to be a straight utilitarian and wishing to treat kin and non-kin equally needs to endorse group selection in order to give their ethical intuitions a basis in evolutionary psychology. Because it is clear that humans engage in kin recognition.
Now I see how you are reading the "kind of claim that a utilitarian could make" bit.
As you previously observed, the actual answer to this involves cultural evolution - not group selection.
The "evolutionary psychology" explanation is that humans developed sophisticated culture which was - on average - beneficial, but which allowed all kinds of deleterious memes in with the beneficial ones.
A utilitarian could claim:
...on the grounds that their evolution involved gene-meme coevolution - and that inevitably involves a certain amount of memetic hijacking by deleterious memes - such as utilitarianism.