We all make mistakes from time to time. It appears that the area for most concern is explosives at this point, and that is good, explosives give you the best chance to destroy an airplane if that is your goal. While other weapons and such can be a threat to the passengers on board on a smaller scale, the explosives place all of the passengers in danger with the real possiblity of folks on the ground under the plane as well. All that being said, I agree with you that all folks should go through a WTMD.