Tucson Shooting

Pratt is absolutely correct that our thoughts are with the victims and their families. He is also correct that what makes this type of event so devastating is its rarity. The U.S. is blessed that its culture is not one of constant murders when political differences arise. Each time some similar disaster arises -- shootings by crazed individuals at university campuses government buildings, or gatherings of government officials -- I wonder what would have happened had more people carried weapons. Evidence provided by John Lott here indicates that when there are guns there is less violence. Could someone have taken out the shooter (s) before he killed six and wounded 13?