This makes them even more vulnerable to child predators whose first objective is to remove the child from the protective cloak of the closest guardian to them. It's all a type of pedophilic grooming. Latch-key homes are a fact of life. So the TIME OF DAY the certain types of content can be viewed is keY to FCC enforcement. By bed time 9pm, the overwhelming majority of homes have the monitoring adults home and have rounded up their children from afar and put them to bed.
So, the FCC has to assume that at any given moment on any network that promotes itself as "family-friendly" with shows on at prime time for kids' viewing, that these networks must act to protect any child viewing anywhere, not just at home. Protective laws for children don't stop at the door step of their insular family home, they follow them wherever the kids go. And they take into account peer pressure and the like (think drugs, instead of sexualized porn in kids' programming). So, the onus is upon the network, not the parent. This is why the FCC has a category in its complain system for CABLE TV. Because it's also part of their jurisdiction; particularly when it comes to protecting children whether viewing at home or at a friend's latchkey house down the street...