Because they didn't account for a paranoid, idiotic populace who should have probably naturally selected themselves already? Listen people, just because something is new, doesn't make it a bomb. A bomb, among other things, REQUIRES EXPLOSIVES. Its about having a mayor who is unable to calm idiotic fears. The cop reaction of shutting down the road added fear where there should have been none, and furthers this inane paranoia. OMG ITS A BOMB! Seriously people, its not even as complex as a lite brite.