transgressors have a clear incentive to leave. But they must share society with others first, and those others shape the transgressors lives in non-trivial ways. So transgression is a social failing too. If they want to stay it’s everyone’s responsibility. But they should also be allowed to leave

I'm reminded horribly of both how the Catholic Church shuffled child molesting priests between parishes rather than defrocking them and turning them over to police, and how police officers get fired in one jurisdiction (but not charged) and then hired somewhere else. Moving a problem doesn't fix it.