See what fear can do to you.
Look at America now, you will see a lot of fear from being terrorized. Rightly so, in my humble opinion. Fanatic groups has targetted them like no other country in the world. I will never forget the scene of 9/11. Here is another story of how, highly strung they are. But giving the police some credit the MIT student in the said news piece didn’t respond allowing them to then react the way they did.
Check out the news clip on how a MIT student was almost shot because she was wearing a MIT course shirt with a “bomb-like figure/device” in the front: http://www.boston.com/news/globe/city_region/breaking_news/2007/09/mit_student_arr.html
Moral of the story: Don’t turn away when being asked a question in an airport! :). Live life and let life live.