How many attacks were there pre-9/11 (and thus TSA)?
We went quite a good long while without it and things were fine. This is fear-mongering bullshit, used to line pockets of politicians and lobbyists, pure and simple.
I don't see how anyone can claim otherwise when the guy in charge of "Homeland Security" (a name that sounds a bit too much like things you'd read about in fascist countries like the former USSR or one of the Axis powers, but I'm getting off script) at the time starts installing x-ray scanners and... OH LOOK AT THAT he has a huge ownership stake in the company that makes them.
And really the best way to "get rid of incompetent management" would be to shut it down. Otherwise it'll just be a revolving door of incompetent managers.