On February 14, 2018, a former student fired a semiautomaticAR-15 rifle atMarjoryStonemanDouglasHigh School inParkland,Florida,killing 17and injuring 15more. The Parkland students turned to social activism, creating the #NeverAgain movement. Since the 2012 Sandy Hook massacre, 239 school shootings have occurred.1 In political debates, gun rights advocates often invoketheSecondAmendmentasanobsta...