Last week, former Justice John Paul Stevens penned an op-ed for the Washington Post on “The Five Words that Can Fix the Second Amendment.” The piece is actually an excerpt from his new book Six Amendments: How and Why We Should Change the Constitution. In the book, Stevens suggests some changes that would ratify his view of cases in which he stridently dissented, such as Citizens United and Heller. Stevens’s dissent in Heller, the case in which a 5-4 Court held that the Second Amendment conveys an individual right to own guns even for those not part of a militia,...