However,to say a pilot is incapable of an act of terror or would rather just use the controls to achieve that goal is simplistic at best and dangerously naive at worst...
I asked a security person once what they were looking for when screening me.
Anything that would enable you to gain access to the flight deck
was the reply as I stand there in full uniform! I don't think it naive at all to point out the fact that out of all the people who work on, or near and aircraft, we are the only ones who do not need to smuggle contraban onboard in order to do naughty thing with that aircraft.