Back in the day, towards the end of 2003 before the whole, "Yeargh!" thing, I was convinced (hoodwinked?) that Dean was the best bet to get W out of the White House. I went to one (and only one) Dean Meetup, and one of the reasons I never went back was because there was a large number of people there who were convinced that the 9/11 attacks were staged by the government and/or that Bush knew about in beforehand.
I'm all for a good conspiracy, but that sort of thing would require hundreds, maybe thousands of people to keep quiet and it suggests that there are hundreds or thousands of Americans who'd be okey dokey with attacking their own civilians.
I'd like to think not.