Indeed, book banning is being promoted: https://www.latimes.com/entertainment-arts/books/story/2020-11-12/burbank-unified-challenges-books-including-to-kill-a-mockingbird

Except this is being done by the crowd that normally promotes anti-racism with a CRT flavor. Indeed, one of CRT's central tenets is that presenting narratives from a race-centered perspective is critical for making progress. It's an easy step from there to say: well, what if we only make the narrative we want available?

So I think it's advisable to decide whether one is really committed to "being discomforted" and embracing openness to encountering a variety of ideas. If yes, one's criticism ought to be directed at portions of both the right and the left.