Please read this article about sex offender recidivism instead of relying on the info of one Doctor in AK http://www.smart.gov/SOMAPI/sec1/ch5_recidivism.html. 
I'll highlight this for you "researchers widely agree that observed recidivism rates are underestimates of the true reoffense rates of sex offenders". Now I do not agree with the attack on this man, but in my years of working with sex offenders I know of a fact how underreported this issue is especially when it involves family members.