This article by Robert P. Murphy is the best analysis I've read on the problem with the continuing TSA escalations (aside from the hilarious satire that is
the Airport Security game). From the article:
It's possible that the "efficient" number of terrorist incidents — for the rest of US history — is not zero. In fact, no matter what procedures are implemented, it's always possible
that wily terrorists will still manage to beat the system. In real
life, we can never guarantee safety. This is why so many pundits'
discussions of airline travel miss the mark completely: they assume that
there is some objective answer of "the right" amount of security, when
this is a complex economic question.
Short answer: the world is a dangerous place, and no amount of precautions can guarantee safety for all people at all times in all places.
So here's a proposal: let's back off the government sponsored security measures and crowdsource the solution. If everyone knows that their fellow travelers could be terrorists and takes a little bit of responsibility for this, collectively we can do a lot better than a centralized agency like the TSA.
Of course the other way to fix this is to stop giving foreigners a reason to hate us enough to want to terrorize us. Last I checked, there were
well over 100,000 reasons someone might want to kill a whole bunch of Americans in Iraq alone.