Interesting question. I have asked myself that one numerous times and no answer. The question istelf makes me wonder why we need almost desperately, to give evil a name as if naming it, will provide a handle on how to deal with it. There are theories. One is that both ends of the extreme actually join and form a circle...that evil is not bi-polar, neither left nor right-wing. Hitler, I find from all of my reading, and that includes Fromm, 'The Anatomy of Destructiveness' and more recently Mein Kampf, was a chamelion, he continuously repeated that the superiority of the Aryan race was bestowed 'by the Lord' upon the German people yet in the same breath almost, railed against religion.
Some members of the Nazi Party openly went to church, others abandoned their faith totally. Many of the members of the party who prayed on Sunday were quite aware of Hitler's plans for the Final Solution.
I think perhaps evil is as evil does. Was Lucifer political?
But there are many here that will disagree with the circle analogy. The left says that all evil is on the right and the right says the its on the left.
In fact, this is an incendiary topic. Watch!