I for one have seen a lot more psycotic captains than terrorists rescently. I think it's a great idea that they should be armed. Perhaps all co-pilots should be issued with cyanide tablets so that they can pop it after being accidentaly shot, as there is no chance that a medical crew will be able to get through the strong room doors that have to be fitted to aircraft.
THE TIME HAS COME TO BAN PASSENGERS FROM AIRCRAFT. BUS THEM. IT'S MUCH SAFER THAT WAY.