> The parent should be the one that controls what the child consumes, not some nameless company or the government.

The ways in which people access community-created content (or commentary) have changed substantially enough that I don't believe this is true any longer. Content providers now bear a portion of this responsibility in addition to child-rearers. That is ethically much more sticky, I'll admit, but I also think that moral imperative does not automatically follow the path of greatest simplicity.