Finally, the gun lobby has filed two lawsuits in federal court in Lubbock, Tex., to compel the State of Texas to allow young people between the ages of 18 and 20 years old to buy handguns and carry them concealed in public places. The first suit challenges the longstanding federal law prohibiting licensed gun dealers from selling handguns to anyone under 21 years old. The second case contests a Texas law setting 21 as the minimum age for carrying a concealed weapon. As a legal matter, both lawsuits should fail. In its recent Second Amendment rulings, the Supreme Court struck...