Here's the best analogy I can think of. Up until last year, I owned some sort of boat for the last 20 consecutive years. When my wife got deployed for a year, the boat just sat in the slip and I eventually sold it. We have a four year old who listens pretty well for her age, but she's still 4. I knew that I couldn't singlehand the boat and watch her at the same time, and my brother was still living in Japan at the time.
There was no law stating that other than the captain you need at least one adult over 18 to watch any children under age five, but I knew that when I was in the middle of docking or any other situation requiring 100% of my attention, something really bad could easily happen if she got hurt or fell overboard . If God forbid something did happen, should I sue the yacht club for unsafe slips, and the boat manufacturer for gunwhales that were too low? No. I chose to do the right thing and not put her in a dangerous situation that could easily get bad really fast. I didn't want to let the boat sit and rot, so I ended up selling it and still miss it to this day.
This was primarily the father's fault, but no punishment will be greater than what he has already received. I would not wish that on anyone. Any further action is nothing but misplaced anger. The show is at fault for letting a father do something really stupid, so there is fault to go around, but the main person responsible for a child's safety is his parent.