I disagree. Just how many children have abused animal when they were young and how many went on to lead normal lives. Even though, most of the serial killers were involved with animal abuse, I would say the percentage is very low of the total number of young animal abusers.
I know of a person, that as a child he was paid a quarter for discarding kittens. He would place them in a burlap bag and pitch them in a river. He isn't a serial killer. He has led a normal life
He is a Demoncrat though.