After clicking submit, I realized the summary needs to make the point that frequent business travelers have the most experience dealing with the TSA. Here's a revised submission with a new sentence in bold:
"Flyertalk (http://www.flyertalk.com) is a forum for frequent business travelers like George Clooney's character in the "Up in the AIr" movie (http://www.theupintheairmovie.com/). Flyertalk posters, being very frequent flyers, encounter TSA checkpoints every week, so they are very aware of how TSA operates. Back on April 30, 2011, a Flyertalk poster started a thread titled "I'll predict that there will be an attack at an airport, and the target will be TSA" (http://www.flyertalk.com/forum/checkpoints-borders-policy-debate/1210846-ill-predict-there-will-attack-airport-target-will-tsa.html). The poster also noted "TSA is about as popular as a case of the clap these days, and when even tourists are commenting on them negatively — which is really a positive for us [business travelers abused by TSA] — I just think something is going to happen. Maybe not a shooting but a beatdown or something along those lines."
Two-and-a-half years --and one murdered TSA employee-- later, the TSA union has called for armed guards at TSA checkpoints (http://yro.slashdot.org/story/13/11/03/199218/tsa-union-calls-for-armed-guards-at-every-checkpoint)."