How would you know that if you were in his/her situation? Have you some sort of "tell if this dumbass is for real or not" device? Do you think it's prudent to give them the benefit of the doubt, especially on a plane. You know....where, if you're wrong, everybody's dead in a split second?
hey, you can't take a chance can you... better to shoot somebody dead who even looks suspicious i say
Infact, lets just shoot all arabs at airports, better safe than sorry