First of all, PPBM doesn't do anything to stop a suicide bomber, right? If the terrorist is willing to kill himself by driving an airplane into a building, what's to stop him from just getting on the plane with his bomb package?
Secondly, you should go back to the first post by fletch4, in which he advocated the local uniform police open and inspect ALL chcked bags. Besides the fact that I think a local police officer is not qualified (unless he's bomb squad) to recognize a bomb, it's slow and expensive. That's the kind of over-reaction that we're opposed to.