Do you think hate can be unlearned or do you believe some people are simply predisposed to it? (Please explain your answer)
Sort of depends on what is meant by hate or even why it's considered 'bad'. Hate can be directed to an action or attitude (ie: Hate what is evil), an object, an animal, a person.
As for predisposition, I can think of an interesting example. When I was growing up, my family would occasionally travel and visit the family of one of my Dad's business associates. They were a very loving family that had 2 kids of their own and two adopted boys. The two adopted boys were brothers who had the same mother. The mother was a drug addict/prostitute who didn't care for them properly when they were young. They often weren't fed/cared for and the older brother would steal/dumpster dive to get food for himself and his brother. (oh btw...since race was brought up..everyone was white, including the two adopted boys).
Anyway, the adoptive family was very good to them, and the older of the two adopted brothers seemed to turn out o k. The younger one, though, never turned out o k. He was wild, and he consistently did mean and cruel things to the natural siblings and to pets. From what I could gather, he was treated as equally with love as his brother. However, eventually his behavior was so bad and un-relenting, the family decided to un-adopt him (not sure exactly what that meant specifically...whether he was committed or something I don't know). But for him it seemed it was probably predisposed by at least partially his initial up-bringing.