Actually, I was not suggesting that there aren't people attempting to do bad things to passengers and planes. Because the TSA is run by government, they have to adhere to ridiculous restrictions on treating passengers unequally, aka "profiling". Privately run security would not face this same restriction.
It was privately run security that let those 18 onto the planes that fateful morning of September the 11th.
I understand the reluctance behind profiling, it can lure you into a false sense of security.
These terror organisations and their henchmen aren't dumb either. Start profiling for one group of people and they'll switch to another group.
It's best to be vigilant and open minded to the possibility that anybody may be a threat: