Clearly we need more CEOs and Heads of Training and Staffing to be held criminally and financially liable for the consequences for their neglect and contempt for those in their employ, who may be pushed to work longer hours and in schedules that are known to be deleterious to their health so as to safely carry the people who pay for their existence.
Unless to you make the person at the top of the tree responsible - nothing will change anywhere in the tree. Look at the example in the UK of newspapers hacking the phone messages of people? Did any of the bosses get banged up in prison?
The very, very few flight crew who might be criminally responsible are those who deliberately crash the plane [Germanwings 2015] and they are already dead.