[xor1]

>This will mix subjects and I don't know enough to plant a flag on this hill let alone die on it, but imagine the moral serial killer who has urges to kill but never acts on them. They can't change who they are (as an adult as far as I know from current research), but they can try their best to affect actions. But their traits underneath are not changing.*

I firmly believe there is a way to change/cure those traits/urges given modern means, while still allowing the subject to possess complete freedom and agency.

[adjkant]

Do you have anything to back up that belief? That's an incredibly strong unsubstantiated belief as presented.