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.
Race is very extended family, and racial preference is regarded as evil. But inter-group conflict is a constant part of human history,
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and ingroup preference is part of human nature whether we like it or not. Lacking ingroup preference at the wrong times can get you killed
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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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