I disagree. It would be PC if the sheriff were the hero just because of his skin color. He's the hero in "Blazing Saddles" because he saves the town. And as far as him being the only black guy in a town in the "Old West", that's not too far-fetched that all the other characters would be white. As for the fact that they all engage in bad behavior... well, the "Old West" wasn't exactly the paragon of virtue in real life, either...