So, you need the supernatural connotations in order to explain that Hitler was bad? Feel free, but to me the problem is the anti-intellectualism of it. Because "evil" is a self-sufficient explanation, which doesn't explain any of the real reasons for the rise of Nazism and cloaks the fact that ethnic cleansing and genocide are very much human behaviors, which history has sadly proven again and again. We're not getting to grips with it by calling it "evil" (or "Evil!!" even), which is mere name-calling, essentially. Name-calling of others that is.