Perhaps all of you gung-ho captains out there would care to go to the Aer Arran bomb scare to Prestwick forum.
There you will read that the moment the captain puts the park brake on the senior police officer present takes over responsibility for the aircraft and its contents.
That has always been my understanding and I still think that an emotive "I want to get out of this" evacuation is still not advisable.
Unlike a lot of you out there, I have been a captain since 1966 and I have a fair idea of what is important and what is not.