Yeah, I think you're on a loser there, it's a genuine problem where security is loaded to the gills with huge queues and.... There's chunks of empty trays blocking up the end. Sure an employee could come along and tidy them up, but there's queues, they're all working to get things through the scanner, watching the body scanner, swabbing the backlog on the side.
All it takes is a lift and dump. A sign perhaps to tell them to do this. Someone perhaps telling them off.
All the person complaining about them was filling the gap in a procedural failure which is pretty much unnecessary.
I know there will always be a few, 90% of the queue seems to be needed to be told to take their coats off as they approach the belt, so they often ignore whatever signage and advice told. but a sign to point at would be nice.