Never say never.
I disagree with the contention that one should never leave a boat until it sinks. Perhaps it is an old wives tale, and maybe someone could correct me, but having never had a boat sink out from underneath me, that's all I have to go on. I've heard that when the boat finally does sink, it can do so abruptly and somewhat violently, taking crew down with it, as it causes a downward flow of water as it sinks.
I would also contend that one should abandon ship in the event of a fire that is beyond control. I think you just have to evaluate the conditions at hand, and make a decision on the spot. Clearly, it is not something to take lightly.
We're told not to judge all Muslims by the acts of a few "crazies," but apparently the acts of a few American "crazies" are enough to judge all Americans who own guns.