I didn't say it's vestigial tribalism; that would be cultural. I'm saying it has a basis in behavior genetics and until recently it was prudent.

Same for religion, I don't know of any human culture anytime in history that didn't have it. I think that if we had generation ships that went on centuries-long trips to other stars and where religion was unknown to the first generation, the ships would arrive full of mummified corpses anyway because religion would re-arise and bifurcate into opposing groups killing each other over doctrinal minutiae.

I don't mean to discourage; I am not saying we need to learn to live with bigotry. Quite the opposite. I'm saying we need to recognize its origins.