Creepy. Pedos don't change, in my professional experience. They can't.
I was just talking to another former therapist about treatment effectiveness. She specialized in these types of perps. She said she thinks one or two stopped offending over the course of her career, and she stipulated she can only confirm they hadn't been caught again.
As to the remark in the OP, "This is becoming more common," do you mean media stories about it are more common, or the crimes themselves? If the crimes, what are you basing this on?