An interesting perspective from the LA Times citing incidents that were stopped by armed citizens:
Guns in America: Arming the right people can save lives
Good guys with guns have managed to keep a list of shooters from carrying out the kinds of attacks that get far more publicity.
" Here are some examples you may not have heard about
: Pearl High School in Mississippi; Sullivan Central High School in Tennessee; Appalachian School of Law in Virginia; a middle school dance in Edinboro, Pa.; Players Bar and Grill in Nevada; a Shoney's restaurant in Alabama; Trolley Square Mall in Salt Lake City; New Life Church in Colorado; Clackamas Mall in Oregon (three days before Sandy Hook); Mayan Palace Theater in San Antonio (three days after Sandy Hook).
There's a reason that you never heard much about the places on the second list. The number of innocent people killed was much smaller — sometimes, none. In each of them, the "active shooter" or potential shooter was confronted by an armed defender who happened to be at the scene when the attack commenced; the bad guy wasn't able to just keep going about his deadly business, as at Sandy Hook."
source:
http://www.latimes.com/news/opinion/...0,955405.story