The horror in Arizona exposes the lunacy of the notion, popular among Republicans, that a heavily armed populace can stop a deranged gunman. After the horror at Virginia Tech, in 2007, gun advocates -- overwhelmingly Republicans -- advanced the idea that the massacre might have been cut short if students had been allowed to carry weapons. School policy at Tech forbids students, visitors and most others to have weapons on campus. The Tech massacre even gave rise to an... (GunPolicy.org)