Well, exactly this is what was to be expected, he is driven from a place where some probation officer or social worker or mental health worker knows who he is and where he is. Either he will go off radar, which is good because......?
Or, he will use costly and scarce public resources, not to change his interest in offending, but merely to save him from the mob. He will be given, presumably, a scarce council flat in some different part of the country, as well as help to disguise himself (masks will help) and a new name. That, he is entitled to, because lynch mobs are the wrong way to sort the problem.
And having him live under disguise and a new identity while free to roam the new community is good, because..........?
Or, having him put in prison, then sent out to roam, totally unchanged in his inclinations, is a good thing, because.........?
Having him in a Reform centre would make a lot of sense. There should be some for substance abusers, some for alcoholics, some for people too mentally or emotionally variant to avoid offending. The latter group would include this man and other violent offenders, the prime clients for Hormone Re-balance, combined with whatever therapy and treatment is proved to work best in other countries, which have bothered to try logical methods.
@Thelnebriati thank you, your post is a good summation.
The only thing is, stopping predators wishing even to seek prey makes a lot of sense. Occasionally caging them doesn't. Not if they are then let out with even more determination to offend, and certainly with many new ideas and knowledge, from fellow offenders, on how to do it more effectively, and with less chance of being caught.
There's no safeguarding, the moment the cage opens. There's no prevention. Justice is a thing rarely achieved in any field of law, or life, though of course it would be nice. Rehabilitation, which you understandably put last, is the only useful thing to aim for.
I agree that, under the present system, putting offenders in cages is the only way to stop them having access to victims among the general public. But it won't stop them attacking others in prison. (Notably, those rapists who, in full possession of penis, demand to go into a women's prison !) Plus, caging people with others who are more experienced, hardened, and can pass on helpful tips to fellow offenders, must be counterproductive.