When one doesn't have the responsibilities of an adult, they don't get the freedoms either. Sometimes it bothers me that 16 year olds aren't allowed to go to a rated R movie or buy a porn magazine without an adult.
But the fact of the matter is that our society has decided to accept some responsility for raising children, and this is how we've gone about it.
But, I think that making this an issue of press responsibility is ignoring (or at least diverting) the point of the cartoons: a large group of people will murder you to ensure your silence.
But, to answer your question, I'd prefer the government to not regulate it at all. However, I don't have a big problem with it.