Extend this preference beyond the immediate family, and people get uncomfortable. There are some good reasons for this--
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businesses and the community as a whole are better off if the best person is picked for a job.
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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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