{Grain of salt - I don't have any kids either, nor much interaction with kids}. My initial thought is that it's a much larger question that just parental controls. You bring up the topic of entertainment issues, which is true that they exist. How we seek out entertainment, what we seek out, and the impact it has on our/our childrens lives is an interesting question. Step one could be controlling what technology and at what times technology is available to children, allowing the curiosity and entertainment to be derived from our physical world with technology as a supplement. PBS, some cartoons, etc. etc and figuring out how to mold the entertainment controls around that subset of content.What, then? Parental controls, only letting your kid to the trusted sources? And who would establish which sources to trust? You? You're a cretin when it comes to the vast information field of the Internet. Even the most educated psychologists are stumbling: how can you do better?
Score +1 point to bfx for having the intuition of a not truly bad parent!