

Sure, I’ll consider psychopathy as a disability rather than an illness. Regardless, it’s pathological.
I think your point about proper support and monitoring is key. Why do we have the problem of psychopaths masking their lack of empathy creating success for themselves in a way that doesn’t involve human connection? What if they didn’t have to mask their personalities or tendencies at all? If I met someone and understood they were a psychopath incapable of empathy but trying to live a peaceful stable life for their own self-interest, which includes not risking that stability by causing grave harm, I would engage with that person until such a point that they expressed a contemptible opinion or did something unsavory. This is the same metric I would use with anyone. Of course I would understand that because the psychopath lacks empathy there are bad things they might be more likely to do, but in a society which is equipped for psychopaths hopefully they would also understand the greater risks for themselves due to their pathology.
I don’t think there are natural born killers even if I do understand that some pathologies, whether inborn or trauma-induced, would make the act of killing unburdonsome to that person. Personally, I can come up with a very long list of why I shouldn’t kill a person other than that I would feel bad about it. I don’t think all people who wouldn’t feel bad about it are unaware of the myriad other consequences which come with causing such grave harm of this or other kinds. If someone truly doesn’t understand in any way why they shouldn’t kill someone and then go on to kill someone, I think that is much more of a problem of the society. That would indicate a severe lack of education and support in addition to their pathology.
To clarify, I am not anti-judgement. I think people’s behaviors should be judged good or bad regardless of whether anyone would judge that individual or their group to be good or bad. Also, I can pass character judgment on the dead because there are no longer unknown variables. I can condemn Hitler as an evil person because as he exists right now as an idea, he is pure evil. The historical human Hitler I can condemn worse because even though he was fully capable of good and fully capable of not doing what he did, he chose to do evil consistently. I condemn historical human Hitler not because I believe he was an evil being incapable of doing good, but that he was capable of both good and evil and chose to do evil. In my mind this is a harsher judgement than excusing bad behavior because of their corrupt soul or any such nonsense.
Also, a point of note for my Hitler example. I do not think that Hitler was a monster or particularly unique. I think Hitler was a man similar to millions of people who exist on Earth today. Some of these individuals capable of what Hitler did have chosen instead to behave differently, while many who desire to emulate Hitler are unable to do so because of the state of their societies. I don’t think Hitler was a special being who single-handedly enthralled an entire nation and forced them to do things they didn’t want to do. I think there were many elements in their society which contributed to Hitler’s rise and continued support despite his absurd statements and atrocities. While we can never live in a world totally free of people like Hitler or people who want a leader like Hitler, I think a world where people like Hitler can’t access the power to do great evil is possible.