The mass murder at the theater in Aurora, Colorado, happened in a theater which has a no-guns policy.
Gee, that worked well, didn’t it?
I might point out also that the killer was stopped by the arrival of more guns – in the hands of law-abiding police officers, in this case. Spree killers are always stopped by the arrival of the next gun. Sometimes it is a cop; sometimes it is a private citizen with a handgun license. But they are always stopped with the arrival of the next gun.
To reiterate the obvious; if somebody near enough in the audience was armed, many lives might have been saved. The cops are only minutes away; if somebody in the audience was armed, they might have made the response time merely seconds. No-gun zones are places where murderers like to hunt, because they know that for a while at least, nobody will be shooting back. It is amazing to me how many well-meaning folks don’t grasp this concept.
And every public school in the country is a no-gun zone, by government decree. Many malls and theaters are also no-gun zones by their own choice. Those signs only keep out the law-abiding.
ADDENDUM 7/26/2012: Article showing that “With a single exception, every multiple-victim public shooting in the U.S. in which more than three people have been killed since at least 1950 has taken place where citizens are not allowed to carry their own firearms.”