Security: In the wake of the Islamist terrorist attack in Paris, former New York Mayor Rudy Giuliani argues to reinstate a policy cancelled by Mayor Bill de Blasio, who has arguably left the city as exposed as it was on Sept. 10, 2001. Although the Paris terrorist attack by Islamists has not been linked to any mosque, the historical record is dotted with similar attacks that have such links, including the Nov. 5, 2009, rampage at the Army base in Killeen, Texas, by Maj. Nidal Hasan that killed 13 and wounded 31 as the self-proclaimed "Soldier of Allah" shouted "Allahu...