Inevitably, the Tucson shootings have reopened the debate on whether Americans would be safer or less safe if gun laws permitted people to carry concealed firearms even — or especially — in places like government buildings or college classrooms. "Concealed carry" is a popular law in Arizona — even injured Representative Gabrielle Giffords supported it — and some backers have suggested that the best defense against future shootings would be to allow civilians to... (GunPolicy.org)