Pious pilot, I think it is your posts that are pathetically childish. It would seem from your remarks that you have no experience of the military whatsoever. If you had you'd understand that warfighting is not the same warm, fluffy politically correct cushy little nest that you live in.
Levels and expectations of responsibility in the military are vastly different from those in civvy street, and isn't that right and proper considering the sort of kit they are in charge of?
If he's not seriously culpable he's probably still got a decent career ahead of him. A court martial always used to be said to be necessary for serious advancement.
Do you suppose he, the Admiralty or his future crew would want to be thinking every time he got into shallow water "I wonder if the bugger's going to run us onto the putty again?" It wouldn't work, would it?
ps. Ever heard of the expression, "Pour encourager les autres?"