Question: Which survivor of the mass shooting that took place on October 16, 1991, at a Luby's restaurant in Killeen, Texas, United States became a leading advocate of an individual's right to carry a concealed weapon?
Sentence (from "2012 Aurora shooting"): Prior to the shooting, Holmes rigged his apartment with homemade explosives, which were defused by a bomb squad a day after the shooting.
Relevant evidence: No