>A claim like that needs supporting evidence. I see no reason why segregation among different members of a single community is natural. Considering that in-gro

>A claim like that needs supporting evidence. I see no reason why segregation among different members of a single community is natural. Considering that in-group-out-group psychology has been humanity's evolutionary default for tens if not hundreds of thousands of years, I'd say the burden of evidence is on anyone claiming the contrary.