It's a good question for this type of personality.
Nature( born that way)
Nurture( parent/ carer influence)
I used to think my ex was born a sociopath. ( nature)
I asked his Father , years before I left him, why he lied about me so much and wanted me to be perceived to the world, especially his family, that i was lazy , a bad wife and incompetant mother, when the exact opposite was true of me. ( I used to video everything , as proof of who I was, cleaning house, meals, attending school events etc)
His own father told me that they knew the truth, about me, that everything he said was a lie, and they ignored his false statements about me.
He then told me that as a baby, they knew he was different and put it down to a birth defect , laying incorrectly in womb, as a nurse stated to his pregnant wife that the babys head seemed pulled back too far ? He said he was a troublesome child and teenager and swore at his own Mother and treated her the same.:what: They had to throw him out of home at 17 , but they still supported him financially big time. And still now they pay him huge sums of money yearly.
Anyway, I loved my Father in Law and all his siblings. I was convinced he was simply born this way , as I was told by him.
BUT, years later I was speaking to a friends husband, who knew my husbands Father. I told him he was the nicest, kindest, beautiful man.And how lucky he was my Father in law.
Guess what? :what:
He said that the man I had described was not the Man he knew , as being the most evil, angry, ruthless man he had ever known. He was adamant that my father in law was hiding his true self , and probably old age had changed him. He was visibly shaken , just talking about him. He had apparently affected him in a profound way and caused him a lot of heartache. His career was badly affected too because of my father in law. :what:
I was left questioning whether it was in fact my husbands father who was the reason for his bazaar behaviour.
In my situation, looking at the nature v nurture theory, and I now believe it is a combination of both.