The point is to be seen to be doing something, so that the nervous public sees that Something is being Done, and so that politicians can say they did all they could the next time there’s an attack. Anything they actually do is very much secondary.

And annoyingly, the real, meaningful things they do do aren't sexy.

Reinforced cockpit doors are basically invisible, but they've also basically made hijackings impossible, especially when coupled with the fact that passengers will no longer assume the plane will safely land and negotiate.