They just don't care, and they have a ton of work with very little funds. Worse, sometimes they will be told not to investigate certain crimes for political reasons. You cannot depend on the state or the agents of it for justice. That truth is one reason I became a private investigator.
He's a lucky guy. If he had done that to my child, things would have ended very differently.
This woman is a hero. But I agree, I'm pretty sure I would have just killed him and ended up in prison myself.