Is vs ought. It /might/ be a biologically rooted tendency (and there is evidence suggesting this is the case) but that does not imply that is how we should be. After all, humans also have the opposite tendency, i.e. to love what is foreign, or an orthogonal one, i.e. to insist on mutual respect.

Human rights have no ontological basis, but they are a valid marker of any form of human civilization.