Most people would be appalled at the idea of not preferencing one's own children over others. If parents didn't, kids wouldn't survive.
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and will at least put you at a disadvantage to others who prefer their own. The optimal strategy is probably to try to match levels
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of ingroup preference with members of other groups (cf tit-for-tat).
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some combination of matching + ethnocentrism, that is. Intergroup cooperation can be useful at times, and so can ethnocentrism.
End of conversation
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