I just don't buy it that kids are a reflection of their upbringing or of their parents. It certainly affects kids, but I've seen some horrible kids come from really caring parents who did not coddle and spoil their kids. Their kids were just horrid, stealing money, robbery, rape, ending up in prison. I've known the parents personally and watched the kids grow up, there is no excuse for the stuff these kids did except they are just purely bad. Kids like that have done nothing but cause their parents grief, because of drug addiction, self-centeredness, and total lack of feeling for other people.
Sometimes no matter how much we want good for our kids, they just go through bad spells because of bad choices they make not because they have been taught that way or coddled. I say a kid's beginning have an affect but society and the friends these kids chose have a lot do with it too. Have any you ever tried to stop a teenager from hanging out with a bunch of drug addicts because they thought they were cool? They simply will knock themselves out to go against everything right to hang out with these type of kids.