Give me a gun and I can guarantee that no hijackers take me over and kill everybody on board
Errr, no you can't, thats the point. Unless you're exceptionally quick on the draw and at a high state of alertness at all times. I reckon if two trained hijackers rushed the flight deck when I've got the full 5 point harness on I'd have my throat cut before I'd got the damn gun out of the holster.