Does a small part of you not feel the urge, however, to check who people are before letting them on your plane. By which I mean, after 9/11 and all that happened there.
I've flown many times within the EU/EEA without showing an ID, so I fail to see why traveling within the US should be any different. I've spent most of my life in the US, but the only times I've been in close proximity of terrorist events have been in Norway (Breivik's bomb went off two blocks away from where I worked at the time, and more recently the shooting outside London Pub that killed two and injured multiple others).
I wish I understood why the US feels the need to overreact to everything.
There are many other ways a person can inflict damage much larger than that without a plane and easier.
We need far more of a culture of "sometimes you gotta take one for the team". This is literally what Charlie Kirk was saying at the exact moment he "took one for the team".
Bad things can happen and you don't have to change stuff just because it happened. Accept negative externalities and don't collectively punish your people for the bad actions of a few.