Yeah, cuz terrorists are so easily discouraged. Anyway, what's to stop someone from exploding himself while he's waiting in line to be searched? Nothing.
Look, I live in NYC, ride the subway and have no trouble at all with the searches.
You can spend your whole life saying, "this is what they can do. This is a weak spot..." or you can assume the cops and others are doing their best to keep these idiots from bombing us.