I agree that Hitler was evil on a scale unlike any other. I also think comparisons should be carefully thought out and not tossed out carelessly. I do disagree with the notion that we should never compare to Hitler and the Nazis. To completely refrain makes them a one off, and treats them as if that could never happen again. I think the tools available to dictators today make the rise of someone or something like that more likely. So I think it is very important that we guard against that, and look carefully at the lessons of history. Again emphasizing we should be careful and not make comparisons callously.