That the worst point about this kind of security checks: it's an annoyance for everybody but don't stop the bad guys.
When I came back in France during Christmas, the whole downtown access to a city was restricted, with checkpoints at every bridges. It slowed normal people for control multiple times a day. But because this "security" wasn't present 24/7 any islamist could import weapons at night and make a carnage during the day, with the additional effect of the checkpoint slowing people from escaping the area under attack. Hopefully, there wasn't the budget to employ national police for all the checkpoints, so technically you could cross them without any security people having the right to stop you, which I did one time.
I don't think that's a claim you can validly make. Perception of how hard it is to get things onto a plane can prevent attacks. And unless you screen everyone's minds, you can't know that that's not the case. I'm not saying the balance is right.
That is not a counterpoint in any sort of way to what I was saying. Fear of being controlled could be enough. Thus making the origin point above my post wrong.
There is a term for what you described, security theater. I'm not saying it's worthless, but it's only not worthless because terrorists might believe it's not.
To the contrary, the stupidity of the average TSA worker is such that it may encourage bad-actors. Having to deal with such buffoons on every flight make it very difficult to sustain the delusion that gov't security is competent. They'd be better off just having everyone pass before a HAL-esque camera that does nothing but give you the illusion that you are being examined by some incredibly competent agent behind the scenes.
When I came back in France during Christmas, the whole downtown access to a city was restricted, with checkpoints at every bridges. It slowed normal people for control multiple times a day. But because this "security" wasn't present 24/7 any islamist could import weapons at night and make a carnage during the day, with the additional effect of the checkpoint slowing people from escaping the area under attack. Hopefully, there wasn't the budget to employ national police for all the checkpoints, so technically you could cross them without any security people having the right to stop you, which I did one time.