If this stands then the next case could well be someone who locks their kid in a cell in the house (remember, the state does this all the time) to keep a troublesome youth from creating liabilities for them.
"I'm sorry your Honor but little Amy is just impossible to control unless we keep her in a cell."
Making parents responsible is an stupid idea, the only way children will learn is if they are held responsible, and feel the consequences of their actions.
Shifting that to the parents accomplishes nothing.
This case is about parents and their parasite attorney trying to extort money, instead of teaching their daughter how to overcome this on her own.