I've been shocked seeing this development in mass shooting cases. It seems obvious to me to prosecute parents who don't secure their guns or just ignore their kids' mental instability, but this is America, and here in Missouri they make guns extra-legal because they're already legal. Hell, a few years ago they tried to pass a law that would require business owners to keep guns on the premises.
So, seeing parents held accountable, it's a little heartening. People need to grow the fuck up.