I am to fly KLM, Aberdeen to Amsterdam next week and even though its a 20 minute flight i dont care about clear plastic bags.

It seems everyone has forgotten that they are inside a machine. A modern civilian aircraft may be designed for all the luxurys of home(with the exception of economy which is designed for all the luxurys of a volcano crater) but is is still and machine that requires rules.
Now i haven't been on a plane since the nighties and back then you could open the doors midflight just so you could slam it shut on the head of the guy sitting next to you because he snored but things have changed.
You dont get pissed and drive a forklift, you dont have your phone switched on in a hospital and you dont carry liquid explosives onboard a plane.