I don't see how a statement as brief as mine could be seen as a revision of history: fascism was a dangerous idea that took over entire countries (so was communism). That leaves out a lot of details, but hardly constitutes revisionism.

I also wasn't trying to suggest that we shouldn't denounce dangerous ideas, in fact such denunciation is one of the primary mechanisms which prevents bad ideas from garnering enough support to make a difference in elections. Rather, I was trying to say that censorship is not the proper way to marginilize dangerous ideas. Only after reading your post and then re-reading mine did I realize that I never specifically mentioned censorship, but that's what I was thinking about.