I'm not the person you asked but these are questions I've been thinking about too as I grapple with discussions around abolition of police and prisons.

I've known people who were driven to move states by a persistent and threatening stalker because nobody would do anything to stop the stalker, right up to a cop casually recommending they get a gun and take care of it themselves. I think the perception of 'dangerousness' is ripe for abuse, but I also I think if your society doesn't have a mechanism for physically separating violent or threatening people from their victims, you'll either get people trying to solve their problems through violence themselves, or you'll end up with the Nazi bar problem, where decent members of your society flee your more problematic ones. The PTSD subreddit was full of discussions around the dread people felt at the impending date of their abusers being released from prison. Prisons are a terrible system, and I know the justice system puts victims through the wringer. But for some victims of abuse, rape, and other violence, knowing the people who hurt them cannot reach them seems to be pretty critical to their recovery and basic health. So how does a better society provide that basic safety?

Exile seems tempting but I think it's worse, it has the downsides of still cutting the person off from their life and any resources that helped them regulate or mitigate their behavior, with the added problem of basically foisting them on the society's unprepared neighbors, and of being harder to enforce.

Counseling without detainment may leave too much room for them to escalate, intimidate, or change tactics, at which point we're kind of back to the victim either fleeing or taking matters into their own hands.

I'd also love answers to this

This depends on the country a bit, but in general, prisons are the opposite of rehabilitation, despite the countries running them telling the contrary.

How gets one rehabilitated when they are pulled from their home, their job, their social surroundings? Supposedly, people are rehabilitated into society - the one they are excluded from and have no access to in prison. Especially in longer sentences - no internet access, years of societal and technical disruption, societies change in the absence of the prisoners. When they get released, they usually have to start over but with the worst conditions - while rehabilitation in prisons claim to help them go l with their standing.

Rehabilitation taken serious would look completely different. Prisons are preventive custody and everything else is an excuse to distract from that fact. Some people may try their best in helping prisoners, but they are working against a system that destroys the chances instead of rehabilitation.