Some people are permanently broken. They can't be fixed. Psychopaths don't get better. Child molesters repeat. All predatory rapists are serial rapists.
Sexual offenders are dangerous.
So, for that matter, are serial violent criminals. I don't mean the guy who gets in a fight in a bar, or the woman who clocks her husband with a vase. I mean the men who repeatedly hurt people in the commission of crime. They are going to do it again. Figure it out.