Jeffrey Dahmer's Phantasies About Murder

Jeffrey Dahmer's parents were always fighting. He would go outside into the woods and beat trees with sticks. The dad even admits in a book called A Father Story Later that he had dreams about murdering people. So it sounds like there's gotta be something in his genetic, no? I don't think so because I feel like most murders, oh well, actually. Right? Like you got a born certain way.