[Taft in '52]

I would avoid using the logical fallacy Leo Strauss dubbed argumentum ad Hitlerum (argument to Hitler) or reductio ad Hitlerum (reduction to Hitler).

Keep in mind Godwin's Law:
“As an online discussion grows longer, the probability of a comparison involving Nazis or Hitler approaches 1.”

[HiTech RedNeck]

Hitler is a good example of a man turned monster. That’s why all the vehemence against using him as a bad example. Too many people with too many guilty consciences.