>To be honest, I am genuinely surprised an attack never materialized.

I'm not. The TSA is hated by the populace the way the population hates every wasteful boondoggle jobs program. Foreigners hate them for profiling but that's pretty far down the list of grievances. Foreigners looking to strike at America and Americans looking to get off the porch likely have dozens of more preferable targets.

I doubt the TSA makes any would be attackers list of top five most deserving agencies.

Edit: A fed sponsored false flag attack on the TSA could make a good comedy plot. It might need to be a TV series in order to have time to fit in all the jokes, references, tropes and wise cracks you'd be obligated to make when covering such subject matter.