Oh, please. They could actually have published criteria, you know, stuff like "convicted of such and such", or "passport from Yemen, North Korea, etc". It's only "political correctness" of the Deep State kind that allows this sort of rubbish - too dangerous to fly, but not dangerous enough to arrest or charge? How does that happen?

Besides, if the TSA/DHS went with anti-politically correct criteria, like say, Arabic style names, or attending a mosque or wearing a turban, even a total idiot will be able to find a Terrorist Sympathizer who's white, female, got a German-sounding name, and convince them to carry more than 4 oz of liquid through the nudatron in their hollowed-out shoes. Even dumber people will figure out that it's obvious you can circumvent the stupid theatre that anti-PC criteria would cause.

I bet the truth is more like the incentives that DHS has. It's better to keep anyone even faintly seeming or associated or accused of "terrorism" or similar things on a watch list, because then, when something bad happens, they've "done what they can".