The problem is not with the screeners, they are following instructions passed down to them from the authorities. A great many of the rules are just window dressing to make it look like they are doing something and are totally illogical.
You can't take nail clippers on board but you can buy a glass bottle of duty free and take that.
We give the pax. plastic knives and forks and then give them a glass to drink out of.
A pilot who spends 12 hours locked in the flightdeck in charge of 300 tons of aircraft and 250 pax. is then not allowed to sit on the jumpseat on one of his own companies jets to get him home after the duty.
I can't take my leatherman airside but an engineer who I meet on the aircraft can.