It appears to me that we have a legal point here. The guy was sentenced to serve a minimum of six years. You may wish to debate whether that was a correct sentence for the crime, but that was the court's decision. Once he had served that part of his sentence, he was eligible for review. We are now a further four years on and he is not yet on parole, but is serving more time in an open prison. They are rehabilitating him in the way that the system is designed. It is to be assumed that he will be on the sex offenders register and will therefore be monitored for the foreeable future. If you do not agree with this route back into the community, then you must suggest an alternative. As I have said, you may not agree with the original sentence, but that's the way it is.