I too would have found the repetitive questions annoying. However, I doubt that most people have ever seen an 11 x 14 camera (I don't think I have ever seen one in person). As you mention it, I could see that the bellows of a 16 x 20 camera filled with some sort of explosives would be a fine prop for a suicide bomber to use in a large city. Less obvious than the vest laden with sticks of dynamite and bags of nails. Imagine the rapture of a suicide bomber as he pushes the cable release and says "smile!" I am more than willing to put up with modest intrusion for the sake of safety, even if it borders on the ridiculous at times.