A sustained effort is under way to deny children access to literature. Under the slogan #DisruptTexts, critical-theory ideologues, schoolteachers and Twitter agitators are purging and propagandizing against classic texts—everything from Homer to F. Scott Fitzgerald to Dr. Seuss. Their ethos holds that children shouldn’t have to read stories written in anything other than the present-day vernacular—especially those “in which racism, sexism, ableism, anti-Semitism, and other forms of hate are the norm,” as young-adult novelist Padma Venkatraman writes in School Library Journal. No author is valuable enough to spare, Ms. Venkatraman instructs: “Absolving Shakespeare of responsibility by mentioning that he lived...