A Narcissistic Mental Illness
Truthers get whacked. The History Channel had a show last night, 9/11 Conspiracies: Fact or Fiction, where they debunked all the theories.
The show was based primarily on the Popular Mechanics debunking, but also included other opinions and interviews.
From remote controlled airplanes flying into the WTC towers to devices that can recreate a voice to fake passenger calls from a hijacked plane (yes, they do believe that) these poor fools are cut down.
As a commenter highlighted a quote form the show on the Hot Air thread, "trutherism is a narcissistic mental illness -- that has got to be one of the best tags I’ve ever seen. That absolutely nails it."