The debate of nature vs. nurture, is it one or the other? Or, is it a mixture of the two?
Nature is defined by the genetic code of the person.
Nurture is experiences that mold and change us throughout our lives.
All serial killers are murderers but not all murderers are serial killers. There are key differences between murderers and serial killers. A serial killer is someone who kills at least three victims one by one in a series of sequential murders, with a form of psychological gratification as the primary motive, whereas a murder may have committed for reasons such as revenge or robbery.
What do you think? Is a serial killer born or made?
Examples:
David Berkowitz (son of Sam). He had a normal childhood with no clear warning signs. His adoptive parents were loving and kind to him and very supportive. The nurturing he received from his adopted parents could not have played a role in the killer he came to be.
Could Berkowitz be classified nature

Jeffery Dahmer. An older boy sexually molested Dahmer, could this be why he targeted homosexuals? His parents fought openly in front of him and when they divorced in his senior year both parents left him behind. It was said that Dahmers mother suffered from post partum depression did this lead to the inability to make a bond to her child

In my opinion they are both, there are many sad cases where children go through abuse and grow to become responsible adults, but when you add a mental disorder to the mix you could be creating a monster.
Genetic traits could be triggered by abuse