During you 27 year watch, how many senior officers were convicted - or even charged - with CRIMINAL negligence?
I can easily check the number.
As you should. I was Lieutenant Colonel - so I wouldn't have served on a court-martial board on a General Officer/Flag Officer. Generally, I would investigate criminal activities and if the evidence pointed to a General Officer as engaged in a criminal activity, the investigation results would be briefed to the Commandant and he would take action - or not.
In the few case I knew about, the General was forced to retire, though most of the offenses I saw were of the fraternization/stupid mistake variety. The General Courts I took part in involved theft, corruption, and one rape case. All of the accused were junior to me.