Oh dear. If this wasnt so misinformed I would laugh.
Just take a look on MN sometime at parents tearing their hair out about one of their kids. All parented well, all brought up the same. I remember one in particular, her marriage broke down as a result of her teen son being violent, refusing school etc and her other kids left with dad as they couldnt stand it either. She tried EVERYTHING, engaged with all the services, school etc and was still being threatened with court if he didnt go to school.
Of course the fact that he is bigger and stronger then her is a major part of that! When they are 6 you can pick them up and dump them into school, but you cant do that when they are 16 and bigger than you! Especially if that kid is violent.
Background does have an impact, I am not saying it doesnt, but personality has far more. Good parenting can mitigate that to a certain extent, but not to the point where it can "cure" MH issues, a personality disorder or just being a twat.
ETA if you read my post I actually said that IF my son had been so inclined I would have been physically unable to stop him. He wasnt, isnt and I doubt ever will be, so I shall take that as an endorsement of my superior parenting by your standards.