The effort to protect our airports is now running into much more friction. The question of threat versus cost has generally been ignored because no politician wants to be accused of not doing enough.
Another way to look at it is here (HT to Doug Gibler for the link).
But there is something else going on. The American way of warfare has found its way to airport security: the US almost always chooses technology and capital intensive solutions rather than labor intensive ones. Israel, the most vigilant country, does not use the new scanners, but relies heavily on well-trained folks who question folks and have been trained to observe people and assess.
Can I expect the US to change? Nyet. We will always choose the expensive, flashy solution.