It's funny to find this thread. I was just this morning reading an article, and I kept having this dread that someone would suggest arming the TSA.
Thankfully, no one that counts has made such a suggestion that I've seen.
I would argue that introducing more guns into the airport environment would make things more dangerous. Accidental shootings, the higher possibility of a service weapon going "missing", etc. That being said, when I've seen LEO's deployed at checkpoints, they're never paying attention....always looking down with a glazed, bored look. If there had been an LEO at the checkpoint, I imagine he or she would have been the first target.