Psychopaths are still people even if their brains are broken. It is indeed hard to integrate them into society, especially if their family did a bad job of it in their childhood.
In a better country he'd be in therapy rather than in prison. Alas the US legal system only exists to detain people, not to allow them to become unbroken.
I wholly believe psychopaths can be redeemed and live a fulfilling life without hurting anyone if given the proper support and guidance. I don't for a second believe the US legal system is equipped to do that, especially the prison system.
Closed institutions are a thing. You can be in therapy under close supervision and unable to leave until it is safe to allow you to do so. Arguably that is better than therapy in prison because even with trained staff on site a prison is still a prison. You could say that closed institutions are functionally a form of prisons and you'd be right but the difference in motivations matters: mental institutions exist to provide mental support, prisons exist to lock people away.
I wholly believe psychopaths can be redeemed and live a fulfilling life without hurting anyone if given the proper support and guidance. I don't for a second believe the US legal system is equipped to do that, especially the prison system.