OFO, I entirely agree with your points re uniform and decorum and the action the RN should take.
As to flying ultra low level I'm not so sure. Out of gliding range of the coast if your donk stops you're going for a swim regardless and I don't see that the time interval between the two is really important. It might, on occasion, be unwise or inadvisable but I rather think "monumental stupidity" is over-egging the pudding a little.