My point is there are many shades of grey and command responsibilities have to be taken in context. I prefer guidelines written by a security expert, endorsed by the state of register of the aircraft and signed by the chief pilot.
Not quite agreeing with you there...You have the responsibility of the flight and your passengers, and unless you are in direct contact with the great Truth which is maybe resting her head on a cumulus above, you certainly cannot assess anything, balance the risks, try to understand...There is a bonb threat, you land ASAP, and that is all there is to say about it. It does not happen often, and it is part of the costs of operating an airline. I never gave a thought to what managers, chief pilots (close to the managers) or anybody else could tell me...I made the decision, and it's very easy when you have understood that you have no choice whatsoever.