It's not like most violent ex-convicts can live in swanky Beverly Hills or tony Chappaquah, NY after they are released into the general population, including sex offenders.
I understand the purpose of the sex offender list. I am not opposed to the list per se. I am only opposed to it as to those sex offenders on the list for which the registry wasn't a condition of their sentencing.
To answer your question, short of moving, you can tell your children to stay away from the dude at 123 Main Street because he is a bad man.
As far as curing a child molester goes, that's not an easy question. Perhaps, they shouldn't be set free so quickly in the first place.