I can speculate. I've been around long enough to have perceived public opinion as not taking these things seriously enough. I have personally participated in trying to get people to pay attention to sexual abuse. And during that period of time, particularly the early eighties, many of my colleagues would be saying things such as “there's no cure for pedophilia”, or “once a pedophile, always a pedophile”. They were saying these things largely as an advocacy position to get people to take sex offending seriously.
Prior to the 1980s there was widespread disbelief that the rates of sex offending were as high as they actually are. You saw a major change in social values during the eighties and nineties where sex offending went from being an obscure crime to being a dominant crime, including a significant portion of federal offenders. That could be part of the genesis of this.
The other genesis of it is the actual rates of sexual victimization. If you asked individuals, or individual women particularly, a large number of them have been sexually abused. The rates may be one in four. Sometimes it's a little higher, sometimes a little lower than that. So it's a big problem. So if you are around any women and ask them questions, you'll find rates of sexual abuse that are much higher than you want them to be.
So, yes, it's a problem, and in terms of the absolute recidivism rates, it is surprising that they're a lot lower than current public opinion would attribute.