What brings an educated individual to plan murdering others, if not hatred, deep hatred to someone, something?

They hate Israel because they think it "stole palestine". It never existed as a state, it was always a territory except when it was ruled by Jews. The name was given by the invading Romans to humiliate them. There is no "palestinian" people, over half are Jordanian and many more are from Syria, Egypt, Saudi Arabia and Lebanon. They moved when they say the Jews settling in the land, I guess they wanted a piece of the action. They left when war broke out on May 14, 1948 because they were told be the invading armies (Egypt, Syria, Lebanon) to leave. Oh, and the king of Jordan said (Jordan is Palestine and Palestine is Jordan".