"The second question is how worked up we should get about a Democrat, speaking with another Democrat, saying that Republicans behaved like terrorists. The answer is: not worked up. Democrats call Republicans nasty names when speaking amongst themselves. Republicans call Democrats nastier ones. Suffice it to say that no Democrats accuse Republicans of being, in the literal sense, foreign-aligned agents bent on destroying the United States of America, while significant minorities of the tea-party Republican base make this accusation about Democrats all the time. But who’s nastier than whom isn’t really the point here. The point is that people who belong to organisations tend to use negative metaphors when talking about members of rival organisations, there’s nothing to be done about this, and it doesn’t matter much."
~ The Economist (stolen from Fan/Phenom (thanks Dan’l)) in this excellent article, one that doesn’t make me feel good, but is excellent nonetheless. You have to read the whole thing.