I hadn't heard that explanation for the novel before, but it makes me think of how Blazing Saddles has already become a bit de-contextualized from what preceded it: A constant TV. show storm--possibly worse than superhero movies today--depicting the "Wild West" as a wholesome and family-friendly place where society was kinda-great for everyone. (Largely due to the television industry regulations and internal standards.)

The movie, in contrast, showed an imperfect Wild West where there was injustice, government corruption, blatant racism, vice, all-round stupidity, etc. It wasn't just transgressive shock value for its own sake.