[I_Am_Nous]

I remember hearing stories of people traumatized as children by Happy Tree Friends, a cartoon series which appears to be child friendly at the beginning of each episode, but gets more and more violent and gory as they progress.

Parents trusted YouTube to keep their kids safe (first mistake) and YouTube dragged their feet on fixing the issue. It's not a "harmless" babysitter like a VCR that a toddler can rewind to watch Barney again, or a game console that can only play physically connected games. It's a portal to any personal hell you wish to choose and dropping the kids off and saying "be back in an hour" sounds risky.