>>51786
Both the will to belong and be accepted, and the behavior to scrutinize for that which is odd and dangerous are naturally evolved behaviors on humans for a reason.
First you distill it down to anthropology. Evolutionary psychology.
We either never had a pressure to evolve empathy as advanced as it would be ideal, or we necessarily evolved to not empathize or see as human that which is divergent, in order to preserve gene diversity for the sake of the species, or perhaps it is an acquired defense against sociopathy which is a trait that has been more frequent through evolution and harmful than we think.