I don't think that Hitler can be credited as the greatest mass murderer that ever lived.
In any way how can you deny the competence of Hitler? We all agree that he was a son of a bitch and we would be better off in a world where he was never born, but as Stalin and Mao he was charismatic enough to take power and change the history of the world. I don't think that you can't call these persons stupid or incompetent. Lunatic sure, but in a way if we just look at their attributes and not to their contributions and destructions they were - well I can't think of a word that has not a positive notion and I'm sorry for that - extraordinary.
I disagree with everything u said, but Whack is right. This is not the place for this.