Tragedy has a way of bringing out demagoguery. This has been especially true in the weeks since 19-year-old Nikolas Cruz went on a murderous rampage in Marjorie Stoneman Douglas High School in Parkland, Fla., and took the lives of 17 young men and women who should be sitting in classrooms today. This includes the Occupant of the White House and others calling for laws allowing teachers and other adults in schools to carry firearms into classrooms, an idea that ignores…