I think the people who are most concerned about this are the ones who think that television is a substitute for real human interaction. They think they can just sit their kids down and keep them out of trouble, and they don't even take the time to look and see what they're watching. And they get offended when their "babysitter" shows their children programmes that are inappropriate for them. It seems to me that if they were really so concerned about what their children were watcing, and what they didn't want them to see, they wouldpay more attention to what was going on. There is a reason for the television rating system (which I think is a great idea, by the way). The purpose of it is so people can know if a show is appropriate for a child or not.
If we were to censor everything on television and make it all appropriate for children, as these people seem to want, then we really couldn't stop at shows such as South Park. Just about every prime-time television show has content that could be seen as inappropriate for children. Everything would have to have a complete overhaul, if we were to really make things appropriate for children. Just because it is accessible to everyone does not mean that it has to be G-rated. It's not that hard to use good judgment, but unfortunately, the ones who are outspoken about this are the ones who are too lazy or too apathetic to monitor what their children are doing. It all just comes down to freedom of speech.