Hate is taught, no one is born with it.

[Disaffected]

10. It may seem esoteric but,

hate can be a product of both nurture and nature. Fear of persons/things different from yourself probably served as an evolutionary advantage back in the days of early human development in the Pleistocene jungle. Same with animals.

Thing is though, humans also developed the ability to reason (albeit with widely varying degrees of success) and most realize that instinctive fears one may harbour are not always rational or just and, we therefore adapt accordingly.

As someone once said "We all have thoughts that would shame hell". I suppose this is true to some extent but a civilized society learns to compensate for our evolutionary baggage.