I'm European. Even pre-9/11 you'd get stopped and made to leave for saying the wrong thing. Post- we've got a guy getting jailed (famously the first person jailed for an act without criminal intent, because apparently airports get an exception from basic protections) because he went for a smoke and some people were scared of his luggage, and the person getting held without charge and without any water was also my country.

> But beaten up because you walk around in the wrong public area of an airport??

Sure, but if you take a wrong turn you're suddenly in the private area, and even if there weren't any signs, well, why did you wander off on your own, no-one else did.