After a shooting at a historic Baltimore high school in February 2019—a 25-year-old man, angry about the school’s treatment of his sister, who was a student there, shot a special education assistant with a Smith and Wesson handgun—conversation in the city centered on whether school resource officers should be armed. Students said that was the wrong question. When City Council’s education and youth committee, chaired by council member Zeke Cohen, held hearings on school violence following the...