I have fought for stronger sex offender sentences in my community for years and have had some measure of success, but the fact remains that there are way to many bleeding heart types that still believe that these pieces of human refuse can be "cured" with "treatment" and "counseling", although there doesn't exist a single study to indicate that to be the case.
If bans on even possessing a device capable of accessing the internet were strongly enforce we could, at the very least, make it that much tougher for sex offenders to find and exploit victims.
And if that is all that it does I would be happy with that.
The answer is simple. When someone is found guilty of a crime, put them in prison. When they have served their sentence, let them out and leave them alone.