it's not the screens I'm worried about
But the people watching throse screens. Airport security hiring practice is a bit of a joke, with a low but constant level of stories about unsuitable people found to have been hired by airports (baggage handlers, etc.) All you need is one person with a squeaky-clean record to be suborned (suitcases of money), or blackmailed (by something in his/her life that isn't a security risk, but which he or she is desperately ashamed of), or threatened ('we know where your wife works...) so as to have them on shift when your colleague, the terrorist who knows a little more about explosives than our dear Pantsbomber, is going to be walking past the scanner.
Or, of course, let nature take its course, with tired, over-working, bored, under-paid, demotivated security staff finally so nauseated by lardy passengers that he or she simply glazes over to the point where someone in a semtex catsuit can hula past the camera and not be spotted.