Parents have been concerned about what their kids watch on TV ever since the first broadcast captured a child's attention. Remember the V-chip, that blocked out objectionable content back in the '90s? Parents who wanted to protect their kids from violent TV programs loved it. Everybody else hated it.
The V-chip never really amounted to much, but we did get a TV ratings system to help guide parents trying to police their TVs. Even that has issues. But in the digital age, it's all gotten messier and messier.