Can I sig that?
racinchikki/Mr. Miskatonic
Hitler gets mentioned here a lot, huh?
If by “here” you mean the SDMB, then no, Hitler doesn’t get mentioned excessively on this message board (although he may be discussed on occasion in the Great Debates forum).
If by “here” you mean the Internet, then yes, Hitler does get mentioned far too frequently on the internet, and, as you pointed out earlier, in an entirely inappropriate context (i.e. person being mean to me = Hitler, or moderator of a forum = Hitler). That’s the reason for Godwin’s law. Once a discussion descends into that form of name-calling, it is no longer an intelligent or useful discussion.
As to why this particular form of behavior, and the other behavior you cited in your original post occurs so frequently on internet message boards – it’s a difficult question. I have seen boards on everything from fantasy baseball to soap operas to beanie babies turn into screaming flamefests. I think the most important reason for this tendency is the lack of consequences on the net. You post anonymously, to people you will probably never meet, and so you can insult them, exclude them, tease them or harass them without getting into trouble. Many people seem to enjoy the sense of power that gives them. It’s easy to speculate about the relative lack of power that these individuals have in their lives off the net, although that wouldn’t necessarily be accurate in every case.
The important thing to remember is that the anonymity and lack of consequences on the internet are a two-way street. It’s just as easy for you to ignore a poster as it is for him or her to flame you. If someone is becoming troublesome or tiresome, your best recourse is simply to walk away (refuse to engage the person). You lose nothing, and eventually the flamer will have no choice but to give up and move on to another target.
Too true, Spoiler. Oddly enough, I somehow feel obliged to remain cordial on message boards no matter what. Even when I disagree with someone, I’ll politely explain why. This the reasoning behind ignoring someone screaming for your blood seems much more compelling hen you have been civil and they just can’t handle being wrong … er, I mean don’t know when to realize wether they will or will not convince the other person of their own point.
I do, unfortunatly, know people who antagonize others on-line on purpose, but they aren’t very popular to begin with.
About as popular as the Nazi party in Warsaw, actually. 
You’re trying to invoke Mussolini, but you letter the pentagram in Fraktur instead of italics.
But he played Aida much better, one of his more powerful roles. AND he liked dogs.