Having served in the Navy over 4 decades ago, and pretty closely following Naval news since then, the only consistent thing I see regarding CO punishments i.e. courts martial is that the Navy will choose its judicial course based on what is least embarrassing to the senior admirals. Prime example, the USS Stark. that ship was in a war zone, but was at basically peace time steaming conditions on orders of the CO. 37 deaths there. No court martial, just CO allowed to retire. Then there was the mishandling of the USS Iowa turret explosion. There have also been numerous groundings, collisions etc where the only result was the CO was relieved, and "allowed to retire".
It seems to me that the senior leadership that has allowed training and certifications to slip to dangerous levels, and permitting routine 100 plus hour work weeks for the crew to exist definitely share in the responsibility, and should be sitting right beside the captains of these ships, and face the same possible punishments. I hate to see the how badly my Navy has deteriorated. I hope I live to see it return to what it can and should be.