Margaret Mead (December 16, 1901 – November 15, 1978)
Love and hate are two aspects of the same human capacity to react to other human beings in terms of experience. The infant whose world is warm, giving and reliable responds with love that echoes the love he has received. But the infant who is continually hungry, cold and neglected will come to hate those who hurt him and do not attend to his needs. In a sense, both love and hate are learned: the infant is born with the capacity to respond, and experience guides his learning.
It does seem true that hatred of a given person or a category of persons or things must be learned. We have to be taught whom to hate, and if we are not taught to hate people in categories, we won’t.