So now the subject of this thread has drifted to commercial air safety, mainly deterrence of passengers who might harm a plane in flight.
I haven't travelled by air since Jan. 1998, not because I couldn't afford to or didn't care to go to places with an airport. This excerpt from one of the late great George Carlin's rants sums up my feelings on that subject.

As far as I'm concerned, all this airport security, all the searches, the screenings, the cameras, the questions; it's just one more way of reducing your liberty and reminding you that they can fuck with you anytime they want as long as you put up with it.