No, I doubt whether anyone is born to kill.
Some just have more chance of becoming killers than others, perhaps because they have an underlying mental illness, or because they sustain a certain type of head injury, or because they become involved with the wrong person. Some have ghastly early childhoods, although, of course, there are many people in this position who never become killers.
Fred and Rosemary West , it appears, were both sexually abused by their own parents. By the time they got together, he had already killed, and it was reported somewhere that he had sustained a head injury that changed his personality for the worse. She was very young and sexually precocious. Without making excuses for what they did, they didn't stand much chance of making it as a "normal" couple.
Peter Sutcliffe apparently has , or had, a mental illness, and it seems that his wife did too.
Ian Brady had an unsettled early life, and , as he grew up developed an interest in sadism, Nazis, etc. Whether or not he had killed before he met Myra Hindley is a matter for conjecture, but I doubt very much whether she had been involved in murder before meeting him. She, unfortunately, got involved with the wrong man, with disastrous results. She wanted something better than what her neighbourhood offered, and believed Brady was different and more interesting than the other men whom she had met. She fell under his spell, and was too young and stupid to realise what she was getting into until she WAS right under his spell. I don't think she was evil from birth.
