When I was a kid, there was one time when I saw something online that I found really disturbing. I remember it to this day.
You know what I did? I went to my mom and showed her. We discussed the situation, ultimately decided we weren't going to worry about it, and that was that.
Kids aren't idiots and they certainly don't need to all be subjected to digital house arrest until they're 18. What they need is for their parents to be available—not overworked and exhausted.