Urge of Satisfaction

I always watch the same shows with my mom throughout the week and one of those shows is "Steve Wilkos". The "Steve Wilkos" show is where the host, Steve, an ex cop, has people who were accused of being child molesters, cheating, or spouse abuse, take a lie detector test to prove their innocence or have them exposed as the liar they are to the world. One episode, I was watching with my mother, was about a mother accusing the father of her child of molesting their 4 year old baby girl and like always the man denies it. He failed several lie detector test and several months after the show was found luring teenage girls on his facbook page and was finally taken to court. Many serial killers start off as child molesters or have been in court for some kind of sexual assault, but not all. It's a feeling of satisfaction for serial killers to not only kill their victim but also to sexually abuse their victim. In this case, on the "Steve Wilkos" show, this man not only molested his daughter but started to lure teenage females to his home. I honestly believe if not caught he would have to eventually start killing these girls to cover his track and wouldn't be able to fight the urge, so he would do it again and again and the cycle would continue, and I also believe that's how most serial killers start off. They can not fight that urge of satisfaction. What do you believe?