From a review I read (someone posted the link here I think), it seems that Trey and Matt bashed virtually anyone associated with 9/11 in any form and anyone that chose to put themselves in the spotlight afterward. They did not, however, bash GWB or JFK at all. It doesn't seem as if anyone really knows how to handle that.
I plan on having this movie offend my sensibilities as soon as possible. Until then, I'll just have to visit SOB.