His kid has free will. If the parents were great the kid may still decide to be a thug.
Parents can do all the correct things and the kid can turn dark.
Parents could be terrible and the kid can turn out okay.
That said most often bad teaching works to make a bad person.
And good teaching most often makes a good person.
I know plenty of well taught kids that came out okay.
Many more come out okay then really bad if the better values of life were pushed over the worse values.
Yep, it's very sad to see good parent who teach good thing and their kid has a bad attitude, people will blame the parent instead of the kid. Since in this thread we're talking about one subject, we can't exactly know if his parent has a good parental or not.
In most cases, many kids end up fatherless because their fathers are absent, they only enjoy the money. Kids needs father figure, but it's kinda hard because the reason why fathers are busy is to make money.