There is real and genuine fear about young people’s use of pornography; usually, that conversation is about exposure to porn online, not in libraries. But this excellent culture wars documentary tells the story of book-banning in red states such as Florida and Texas, where religious rightwingers are crusading to protect children from “obscene” books. Usually that means titles about LGBTQ+ issues or race, and books about girls getting their period aren’t safe either. In Tennessee, a school board banned Maus, the graphic novel memoir of the Holocaust by Art Spiegelman, for mouse nudity. The utter nonsense of it would be...