Tell me, how do you tell the difference between an Arab Muslim and, say, a Hindu Indian? What about a Jew from Israel -- how do you know that he's not an Arab Muslim? How about a Christian from, say, Lebanon? How, pray tell, do you discern the differences?!
And then there are the Muslims from Chechnya and Central Europe (Albania). They are, mostly European in appearance and ethnic origin. I used to work with a gentleman who came here from Albania. Blond hair and blue eyes -- and raised Muslim.
there has to be some uniform standards of behavior when traveling on a plane. you can't have a security system that searches white grandmothers, while allowing 15 bathroom trips to wash for prayers by Muslims, and allows them to use the lavatory to eat "outlawed" food, all in the name of politically correct "tolerance". it just won't work.