There's nothing that you can do to stop visual profiling, however, back on topic, it sounds like a great idea. However, what about cleaning out the gore-strewn chamber after an explosion?
I don't mind airport security, but it does seem to be quite crazy nowadays. I don't see why the flight crew isn't armed to the teeth. That would probably end most of the problems with hijacking:
"This is a hijacking! Everybody-" BOOM! the mouth isn't attatched to the head anymore. It only makes sense, especially for the pilot and copilot.
-Penguin