Does it really have to fit in the right/wrong classification?

Can't it just be an evolutionary survival mechanism?... One of the things that primarily is designed to help people come together and stay away from danger.

I'd imagine at the core of it there is a neural network (that you're born with) that categorizes things into - "like me" - "not like me".

In of itself, it's not something that's right/wrong in a moral sense, but how it's further consciously used can be.