Common sense = survival
Great to see that wise heads are showing the way for the in-experienced. The CARs mandate that the PIC will carry enough fuel! You will never want to be in a court-room facing a be-wigged tw@t asking why you didn't carry enough, nor, as F/O, why you didn't question the calcs, or refuse to fly.
I recall there has been two flight crews prosecuted for manslaughter in this vicinity over the last ten years. The law supports you to be conservative and safe, why do anything different?
PS well done to the diverting crew!