First off, thanks Dani! :-D Didn't see your post until just now!
OK you did read my post, but I still can't see where I said that crew would defuse a device.
Asking what good it would do to infrom ATC that you had a bomb threat on board? Isn't that arrogant presumption on the part of the pilot who makes that decision; that he's better trained to deal with it than the professionals on the ground? And why would you be shot out of the sky for having an expliosve device on board? Surely if there was still a pilot in command then there is no threat of a suicide attack on a ground target?
And what of the consequences on the ground? You get a nice devert to LHR and on to stand them BAM! Of course, if ATC knew of the situation and you'd been divereted to STN and put on remote then perhaps the people in the terminal, on the ground and on neighbouring AC wouldn't have died?
And there lies my point.