Fatuous thread
Locked door prevents terrorists gaining control of a/c by taking over flight deck.
End of story.
(If I should see a 10 year-old outside waiting for the toilet, I am not inhibited to go for a pee, obviously. Rather stupid previous comment. If I see a suspicious-looking person, having scanned with the cameras available to me, I just ding the CC and ask them to clear the area...simples....if there is a problem, I stay on the right side of the door and deal with it.)