After decades of political inaction after mass shootings, the Annunciation Catholic Church shooting appears to finally have spurred conservatives into action. That’s because this horrific slaying was the grotesque gift the right had been waiting for: The shooter – whose diary entries show a troubled young person immersed in extremist, racist online culture – happened to also be trans. The Department of Justice is now considering options to ban trans people from owning guns, with senior department officials reportedly dedicating numerous meetings to determining precisely how to strip constitutional rights from an entire category of Americans. The effort is as...