Holocausts are not the result of hatred, although they are accompanied by hatreds. They are the result of self-righteousness and self-righteousness characterizes those who (1) are convinced they know what justice is and (2) are convinced that they embody that justice. So armed, even torture and mass murder are acceptable, are justified.
Hitler’s holocaust encompassed more than killing Jews. It encompassed the British, the French, most of Europe, Russia, and communism. It was the result of Hitler’s conviction that he knew was justice was and that he embodied that justice. “Heil Hitler!”