Less than a week before Omar Mateen walked into an Orlando gay club and killed or wounded more than 100 people, the Homeland Security Advisory Council (HSAC) submitted its Countering Violent Extremism report to Department of Homeland Security (DHS) Secretary Jeh Johnson. The report instructs the DHS not to use any language that might be “disrespectful” to Muslims, including (but not limited to) the words “jihad,” “sharia” and “takfir.” The report was crafted by an HSAC subcommittee that Secretary Johnson created in November 2015. The head of that subcommittee, Farah Pandith, was appointed by Johnson in May 2015. The subcommittee...