Fifteen years ago next month, an armed man drove his truck through a Luby's restaurant in Killeen and opened fire upon the crowd, killing 23 patrons and wounding 20 others before turning the weapon on himself. As a direct result of the Oct. 16, 1991, Luby's incident, in 1995, Texas lawmakers, led by Suzanna Gratia Hupp (whose parents were both killed in the massacre), passed a law that allowed Texans to obtain a concealed-carry handgun permit. Concerns were raised that the new concealed handgun law would create more problems than it would solve, turning residents into armed vigilantes who would...