I'm very interested in serial killers and their stories. I've probably read the wiki and other sources of about 30 SK just over the last couple months alone.
What you notice is that not only did many of them face abuse from authority figures or others in their lives, but many of them suffered major trauma to the head, and, commonly, the frontal lobe of the brain, which regulates impulse control. Now this doesn't absolve or excuse them in any way. Many people suffered those injuries in life and didn't go on to be SK. But combined with other factors it makes for an explosive mixture. Many of the absolute most nefarious were also homosexual and that was so taboo back in the days that they had to repress their sexuality. They're just powder kegs waiting for ignition.
https://www.murdermiletours.com/blog...ies-as-a-child
Ramirez had a dresser fall on his head at 2 y/o. At 5 he was knocked out by someone swinging on a swingset. This caused him to have seizures throughout his teen years. He was also raped violently in juvenile hall, and there's stories of a cousin tying him up in a graveyard overnight.
Lucas' mother smacked him with a 2x4 in the back of the head and let him lay in a coma for 2 days without taking him to the hospital. Lucas also claimed his mom dressed him as a girl through his formative years up until he was a teenager. That had a major impact on his psyche.
Gacy's father was an unrelenting bully. Beat JWG unconscious with a broomstick at 6. Who knows how much CTE accumulated from the non-concussive blows he suffered as a child/adolescent.
If you read about Charles Whitman, the Clock Tower Killer, who killed 10 at the University of Texas, which basically sparked the SK craze over the following couple decades, you'll read that he had numerous visits with a psychiatrist because he had uncontrollable violent impulses. He wrote a letter the night before he went on his spree - also the same night he murdered his wife and mother in their sleep - basically claiming that he knows something is wrong with him but doesn't know what, and he hoped that they would study his brain after his death. With what we know about CTE now, his story is familiar.
Personally I do feel that these are major contributing factors. I don't believe that each of them were born evil. I don't really believe anyone is born that way, but some very young people have done some horrific things, and it makes you think.
In the 70s and 80s the number of sk exploded. The 80s in particular were insane. At one point there was 3 (4 actually when we include the accomplice) guys, completely unaware of each other, going around Southern California in vans and picking up teens and hitchhikers and torturing, raping, and murdering them, and dumping them along freeways. 2 of them had nearly identical M.O.. These individuals accounted for over 100 convicted murders, all of them acting simultaneously, but again, unbeknownst of each other. That's just crazy to me. In San Quentin 4 of Californias most notorious sk formed a Bridge (cards) club. Wonder what kind of conversations go on at that table.
And that's another thing that is crazy to me is how these guys sit on death row for 20-30 years. California votes capital punishment in and votes it out. Rarely do they execute even when it has been voted in. But even in other states some of these guys go a long time without being put down.