Do these idiots really think that the cockpit is the only way to do damage to aircraft and bring them down. Look at Nairobi rescently. People on the ground trying to shoot aircraft down from the ground. I hate to let the powers that be know, but when an idiot is prepared to die for a stupid cause, you can stand on your head and you wont stop him. Next some like minded air brane will propose that the aircraft be flown by remote control, and passengers be bussed to destination, as that way there will be no intervention by humans at all.
The time for paranoia is over. We can not let a few fools in the world dictate policy to the masses who are law abiding, reasonable people.