Which is arguably the fault of the prison system, which is not focused on rehabilitation. This is just further exacerbated by the privatization of the prison systems which has left them as revenue-generating machines that are not even remotely concerned about the well-being of the prisoners and their rehabilitation, not that it was much better when they were publicly owned as everyone is more focused on vengeance than rehabilitation.
Which isn't proof of anything other than that one guy re-offended, committing another violent crime. That does not prove that all people will commit crimes once released if given the proper help, or that other murderers can't be rehabilitated.My favorite one? Guy who had been serving time for murder, gets released, and the day he got released he rapes a 12 year old girl. He should've never been let out in the first place since he was still a danger to society.