Lets not forget what else this guy did. He promised he'd get Germany out of a world-wide depression, and he did. He promised he'd rid Germany of the people he blamed for them losing WWI, and he made his best attempt. He also designed several cars, and had them built. He improved Germany's military strength, and improved Military Technology.
True, he was a world-class psychopath, but he was also a genius, and perhaps the last politician who even made an attempt at doing what he said he was going to do.
I'm not defending him, I'm just pointing out what he did besides the Holocaust.
7/10