were being sent to a convenient (to them) airfield 30 mins away from the one below you
That was the statement i was responding too. You might well have an airfield below you, but if "they" don't want you to go there (because of a bomb-scare, threat of hijack or whatever), you WILL be directed elsewhere be it via R/T backed up by fighter presence or by being intercepted and directed.
I wasn't for a moment suggesting that you might "loose you wits", nor was I suggesting that you have to abdicate command of your aircraft, merely that in the above situation you would be well advised to do as you are told. Even if does tread on your ego.