I know of one personally and he is in good standing with his congo. He was finally df'd after 20 years of my persisting my campaign against him. My sister and her stepmother (the pedo's current wife) finally came forward to back my story. He was reinstated after 2 years. Don't think anyone in his congo knows.
As for statistics on sex offenders--proceed with caution. A large portion of people on the sex offender registery probably should not be on there. Public urination, "Romeo & Juliet" romances, and other "victimless" crimes can cause someone to be placed on the list. If you research the Dept of Justice statistics you will find that sex offenders have one of the lowest recidivism rates for crimes. Most professionals who have to deal with the registry say it is an ineffective tool because the real abusers are obscured by the sheer volume of people on the list (most of their crimes not related to abusing a child). Sexual offense has become a tool for politicians to gain or keep office.
I am not siding with pedofiles, but I also happen to personally know some men who were wrongly convicted of sexual crimes and they are on the list--they cannot find jobs, fear for not only their life, but the lives of family living with them. If you do some in-depth research on the matter, it should scare everyone in the US how easy it is to get charged/convicted of being a sex offender on the unsubstantiated word of anyone. There does not have to be physical evidence to get a conviction. It is considered an "atomic" weapon for women seeking to get a divorce (and revenge at the same time). When a person is charged with a sex offense, it is guilty until proven innocent.
As a victim of a sexual predator I used to think the registry was a good thing, but doing some research has made me change my mind. I also do not agree with the court's stance that a person can be convicted without evidence of any kind and solely on the word of a child. Some troubled children do lie unfortunately...well anyway, I will get off my soapbox.