Chances are this guy was purposely hanging around where younger kids were. This Mother was obviously on top of her parenting and her child's activities. This kid is a pedophile and he is only practicing, he will get better. Prison & other pedophiles will teach him the tricks of the trade, another huge reason that child moltested and sexual predators should never be real eased from prison. They should definitely NOT be allowed to be around other sexual predators. "Protecting" sex offenders by segregating them to only be around other sexual predators is a perfect map for like minded people to compare stories, discuss strategies, learn from their mistakes & meet people who can help them when they get out. 
Prison is Social Networking at it's finest. A sex offender paradise! They are safe from people who hate sex offenders teach each other how to be successful sex offenders without having to worry inmates ratting! We are stupid & ignorant to think we should allow these people be together!