I agree with Wanderer that issues within the Middle East has gone on since the dawn of time. This might sound crude but 9/11 was the United States invitation to the party ( in regards to World Terrorism).
People balked about the procedures that the TSA puts its passengers through to accomplish a trouble free flight/train ride/bus ride but another "Underwear bomber" scenario which this time it worked would quiet the rebellion.
Until we (U.S.) can stop playing defense when it comes to travel, we really have no choice. The scary thing is when a terrorist has a bomb placed inside themselves and succeeds in his objective where the search would then include Body Cavities by machine of course.
Can't speak for no one but myself, but I will give up a few minutes to make sure I land at my destination in one piece !