How do you know they are psychotic/criminally insane? They usually really nail it down when they go on shooting rampages.
Men are notorious for not seeing doctors, nevermind addressing mental health issues. I’d put that on my list of things men need more support in doing.
Again though, these guys have histories of domestic violence. In this case, the shooter was incarcerated for it and he still did it. Jail alone isn’t a solution to damn near anything.