Well, I think Greg Allen is correct in that people will make of it what they want and right now going through airport security is not exactly a positive experience for most people. I know I used to really enjoy meeting people at the airport but now there is nothing I can think of that is worse.
Gepetto
How could you build a Playmobil model airport without the security checking area?
Agreed, people make of it what they will, and the people who don't "get" this set have presumably never taken the trouble to introduce their kids to the unfamiliar.
When I have kids I'm planning to use these sorts of sets, and the doctor and the dentist, to let them know what to expect the first time, so they're less apprehensive.