There was a time when parents used to be the channel through which children learned about the outside world. They could decide what to tell their kids and when to tell them what they needed to know. Television has destroyed the system that segregated adult knowledge from child knowledge; children need to learn in steps and stages instead of having so much information, much of it unwanted, stuffed down their throats.
There is so much on TV that is harmful for children. Television takes our kids across the globe even before we give them permission to cross the road.