flatt
The fact that you equate a person warning you about the dangers of toxic people with barely being better than one themselves means you personally need this knowledge more than anyone. You are very much at risk and certainly not from me, I can assure you. Calling out your naivete on the matter is not aggression. Far, far from. I suppose I'm guilty as charged in not having much empathy left for the Cluster B individuals of the world. Virtually everyone who has had their lives ruined, their (often overflowing) empathy weaponized against them, and their belief that people are fundamentally good destroyed, tend to end up that way. And that's one of the hardest things in recovery: most people simply can't understand it until they've had it happen to themselves personally. After all, perhaps the psychopath is the real victim here. They certainly play the part very well. Believe whatever you want about me, an internet stranger, but this is coming from a genuine place of empathy and (hard) love. So, lets try something a little different.
There's a certain catharsis in some Cluster B abuse recovery circles in passing around stories of the well-meaning idiots that go to dog rescues centers to adopt trained fighting pitbulls. They believe all the dogs need is a good, loving home and all will be well. Often, this is actually the case... right up until the moment that it isn't. Suddenly, somehow, the owner's face is inside of the pitbull's stomach, their tracea is in the neighbor's yard, or their child is lifeless on the floor in a pool of blood with the dog "smiling" at them. Everyone is shocked, SHOCKED, I tell you. How could this have happened?
Your empathy is not going to fix psychopaths. Not at a personal level or a societal level. No amount of love is going to give them a functioning conscience. Whatever happened to create them (no matter how awful) never justifies what they do to others. Personally, I don't give a damn about Reiser and wouldn't trust a single word that comes out of his mouth about anything. I used his filesystem once back in ~2004 and that's the most positive thing I have to say about him.
You are asserting that people without a conscience and a proven violent criminal past belong back in general society after some hypothetical rehabilitation program. Further, you are asserting that it is the US prison system (and by extension, the US itself), that is somehow failing these supposedly misunderstood people. The reality is that there is no fixing a lack of conscience and giving these people social skills training only gives them more tools to exploit people by. Literally every mental health professional will tell you that. Those that deviate from this position have a strong tendency to end up strangled in a ditch somewhere with their underwear around their ankles. That is why I tell you to shelve your virtue signaling until you actually understand what you're advocating.
You want these people out of prison and moved right next door to me and my family. I merely want you, since you've made it personal, to try dealing with them first... ideally firsthand. Barring that, maybe look into the reality of the situation first. The good news is that if you do manage to fix them, there's a Nobel prize waiting for you and you will be remembered as the greatest psychological mind in history.