Slowjet and Ironbutt, totally agree, you nailed and summarized what should be and/or should have been done:
the commercial doesn't care, my current employer shows it on a daily basis, they don't fly those planes to dodgy destinations, hence diversion is your friend. If company doesn't listen to your concerns and does not back you up , why should you go out of your way to satisfy it's ambitions. Pilot professionalism comprises "safety first" as well ! Tankering, not tankering, expensive diversion, who cares, how expensive is this landing at destination going to be now ? Way more expensive than a diversion ? You bet !!!
Save yourself first !