“When I use a word,” Humpty Dumpty says in Lewis Carroll’s Through the Looking Glass, “it means just what I choose it to mean — neither more nor less.” Through the Looking Glass must be a favorite of PEN America, a nonprofit organization that bills itself as standing “at the intersection of literature and human rights to protect open expression in the United States and worldwide.” THE LATEST BOOK BAN HOAX To PEN, a “book ban” doesn’t have to mean a “ban” per se, just a decision regarding a book that PEN objects to. Which is why the country seems...