Is the MPAA a Film-Ratings Bully?

This Businessweek article gives the overview of the situation like every other article on the subject out there. But it also has some interesting quotes from people on both sides of the argument for/against the rating.  The argument for the MPAA's decision is this:
“Harvey and the director keep saying that we should make an exception for this movie because it’s important and people don’t really care about language anyway,” the theater executive says. “That’s dangerous because it makes ratings officials into censors. People who rate the movies shouldn’t be deciding the quality or importance of the movies.”