Relative security

Having just returned from Warsaw with an airplane, it struck me how I could have gotten on board any of the airplanes without even showing my boarding pass, I'd like to think that they at least counted us when we sat in the plane, but even that is not a fool proof solution as someone could've gotten lost on their way to the plane, and someone else could've taken their place, kinda like the buddy system.

It's kinda funny how all the security in a place like Copenhagen is all for naught when someone can just waltz in and get on a plane. Also I don't trust the metal detectors as I wen't through one twice and it only went off once...