Looks like ya may have found a piece of the puzzle..
"Other situational offenders see children as a substitute for an adult partner. Although these types of offenders do not harbor a singular sexual desire for children, they may react to a built up sexual impulse or anger, that to them, is irresistible. However, the victim is incidental. It could have been a store clerk, an elderly person or simply a woman walking down a lonely street. Because of the circumstances at hand, such as the Polly Klaas incident, the victim happened to be a child. His main criterion for a victim is availability. The situational child molester will usually have few victims, sometimes only one, and never repeat the event again. He could be a social misfit or a psychopathic personality who harbors a seething resentment and hostility towards society in general. "