Once a kid reaches the teen years parental influence wanes, in deed kids spend more time with the internet than their parents and peer influence becomes a big factor. I'm not absolving parents of moral and ethical responsibility either and when they fail it becomes obvious. However many people teach their kids to be racist or some other form of bigot, be it a religious or ethnic one and there's no law or accountability for it in most cases. Teaching kids bigotry is a form of child abuse that sets kids up to be suckers and fools, marks for con artists.
Each case must be weighed on the facts, sometimes kids turn out bad through no fault of the parents, other times they are directly responsible, that's what judges and juries are for. There is no law against being an asshole however, or turning your kid into one, even if it's a rich banker teaching his kid to be a greedy prick.