Editor’s Note: Jennifer Tucker, PhD, is a professor of History at Wesleyan University and the founding director of Wesleyan’s Center for the Study of Guns and Society. She is a member of the Historians Council on the Constitution at the Brennan Center for Justice at NYU Law School. The views expressed in this commentary are her own. View more opinion at CNN. CNN — Jennifer Crumbley, the mother of a teenager who shot and killed four students and injured seven others at an Oxford, Michigan school in 2021, was found guilty Tuesday of all four counts of involuntary manslaughter. For...