I belive that some of it does come from childhood trauma. I don't know if it is "evil" or just a psycological defect. And when you look at someone like Manson, you can't help but wonder what would have came of him had he not been abandoned and severly neglected by his mother. You can look at that case and say "well yeah it makes sense he would grow up to be a lunitic." But what about Dahmer? He had a fairly normal childhood. His parents were divorced but there was never any talk of abuse or neglect fomr them, mabye percieved neglect on his part but nothing bad. Yet he still did what he did. I think it's a 50/50 thing. It all depends on the person who was abused or neglected as a child. And certain brain function affects the outcome also. It's just really hard to say.