Unfortunately death, injury or prison is not usualy a deterrent for those who fly recklessly. In their world, there is no comprehension that what they are doing is even wrong, let alone something you could be punished for.
Interesting points about CRM and cockpit gradient, remembering the AAC have had SNCO aircraft captains responsible for commissioned pilots for years now and seem to have reached a thoroughly professional level of crew cooperation outside the normal bounds of rank and seniority. So in that environment it is incorrect to assume the senior (in rank) pilot will call the shots.
The most dangerous flights are, and will continue to be, when Mate A and Mate B go for a jolly and to all intents and purposes, nobody is command of the aircraft. It is also the responsibility of Authorising Officers to recognise the potential for complacency with such flights, and provide an appropriate breifing with the authorisation.