Bart,
I couldn't agree more about the stupidity of the selectee screening. I did put a capital "IF" in the front of my sentence just to indicate that IF that's really what the Management thinks about selectee screening, then I could see why the passenger shouldn't be allowed to go back by himself.
But, again, I agree with all your three points against the selectee screening. I, too, think it is a waste of time and resources, both of which could be used much better for the regular screening.