I would say that violent behaviour has presumably been manifested in some way. Simply having a diagnosis does not mean you're not answerable to society for your actions. At that point, oftentimes, either the military or the civilian disciplinary activity occurs. At that point, the onus is on the individual to prove why, or why not, they undertook their actions.
I would say that, generally speaking, it may be out of the military's hands. If you're talking about somebody who has a medical diagnosis and who is being released from the military, really, the onus is on the military to try to gently hand over that person's care to the civilian sector, as opposed to just releasing that person and sort of washing their hands of the person.
I would certainly hope--and I'm not an expert in this area--that is generally occurring, but I can't speak to any particular cases that you may be talking about.