Support WBURHard Lessons From Two Mass Killings In TexasPlay04:27Download AudioJohn BurnettNovember 20, 2009 ShareOct. 17 1991: A policeman stands in front of the Luby's Cafeteria in Killeen, where the day before, 23 people were massacred by a gunman who opened fire in the crowded cafeteria before killing himself. (AFP/Getty Images)