i really wouldn't be so sure of that. some people just have somewhat more stubborn/active/strong/etc. natures. really, the important thing is the growing up and shouldering one's own guilt, accepting one's own decisions and realizing their parents were just human. i've seen many a child with wonderful families go down the wrong road. it's inexplicable. and here i was with an utterly horrible family and i went the opposite route...until i got out on my own and flirted with disaster for a while. but you grow up, you look back an hopefully mentally shrug and say "what the hell was all that?" and turn back around and face your future with some great lessons in your past.
I know my parents are just human, and that they were my choices. But if they had listened to me when I first asked for help then I can tell you for nothing that I would never have gone as far as I have. They are shitty parents, but great friends. Once they figured out that they should have got me help when I asked (which they admitted once I turned 20, had someone to talk too, and got better control of myself) they kind of backed down as parents and now we get along ok.