Watching movies from the 1940s is like being transported into a different world. Men wear suits, and women wear beautiful skirts or dresses. No obscenity or vulgarity corrupts the scene. Male characters are manly, while female characters are feminine — both for good and for ill. Few people of loose morals earn the glitzy lights. Traditional family life, with male providers and ladies minding the home, is normative. Think “It’s a Wonderful Life.”Then everything changed.Joy Pullmann, executive editor of these pages, meticulously catalogues episodes of this revolution in her new book, False Flag: Why Queer Politics Mean the End of...