Thank goodness our just got a bit 'lippy' as teenagers and soon grew out of that. But a friend went through real violence from her daughter, and she had bruises and cuts she always excused as being clumsy. I can't imagine what she went through. I also know of one young mum currently who is also suffering physical and emotional attacks from teenage son addicted to computer games which are violent and way above his age.
These parents suffer in silence, because of the shame, the fact the child is always believed by SS, and because they love their children. Just like others in the past have protected children who have committed crimes.