Well, I've parented three children, so no.

Also— there is no reality in which a parent can completely control everything a child sees / interacts with. Nor should they, that's not a healthy growing environment. Neither is one where the government does the same. And I don't think they would by doing this—it would be just as successful as a parent trying. Because laws prohibiting stuff doesn't make them disappear, people would still talk about stuff, and your child would still be mildly exposed in some way.

My point was that if a parent wants to try to limit what their child sees, that's their prerogative. I do not, however, think it's the government's.