[onewhippedpuppy]

Supe, you're largely talking about menial jobs here. People stand at x-ray machines, take your shoes, and occasionally get to wand and frisk. There's not a huge amount of mental capacity required. I would blame many of the failures on mismanagement and lack of proper training and procedures. That is a job that you can train nearly anyone to do, but you have to properly train and monitor them.