Pepper spray, police and cardboard signs failed to prevent the June 5 Seattle Pacific University shooting. Let’s stop mass violence on college campuses by defending college students’ right to carry firearms on campus. Tragically, this is the third column this year that I must write defending college students’ natural right to self-defense on campus. In the Seattle Pacific University shooting, four more American youths took unnecessary bullets in a gun free zone. One student was killed and three were severely wounded when a young man with apparent mental health issues, 26-year-old Aaron R. Ybarra, began firing his shotgun on...