do you really expect them to think? They have a hard time dealing with reality, thinking is beyond their capability.
The entire security screening process in the US airports, what is checked, when and where, is a joke. So many things make no sense, and done just to pretend something is done. I only hope it get better over time, as reflexive, knee-jerk, "oh-my-god-lets-do-something!" gives way to real improvements.
One can always dream, right?