Sounds like it will encourage parents to stop having kids because kids are too much of a liability... I can approve this idea on those grounds alone :)
Maybe.. what if their kid has mental health issues? What if their kid was traumatized by someone at school and has caused a psychotic break... I dont think these incidents are as straight forward as "the parent didnt teach their child to be a good person".. psychology is a great deal more complex than that. Good people with good morals who have a predisposition or are just traumatized enough can do horrible things because, well, they can be insane in those moments.