For me, it's all the suck brought on by a pathological fear (trauma) of authority figures abusing their power. In this case: TSA, and their ability to completely screw with your travel plans. To be clear, this is not rational and 100% nothing bad happens.
As someone who goes through TSA several times a week. Nah fuck that, some of the smurfs are absolutely there to fuck your day up just because they can. I'd say about 60% of the officers are highly mediocre, about 30% are good, but that last 10% are just malicious.