Everyone knows the terrible litany of gun violence: Columbine High School, Virginia Tech, Ft. Hood, Tucson, the Cinemark movie theater in Colorado, the Sikh temple in Wisconsin, Sandy Hook Elementary School.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.

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