5 cases against 62 does not make A case, and those five only met one of the criteria used in the Mother Earth study.
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There is no evidence indicating that arming Americans further will help prevent mass shootings or reduce the carnage, says Dr. Stephen Hargarten, a leading expert on emergency medicine and gun violence at the Medical College of Wisconsin. To the contrary, there appears to be a relationship between the proliferation of firearms and a rise in mass shootings: By our count, there have been two per year on average since 1982. Yet 25 of the 62 cases we examined have occurred since 2006. This year alone there have already been seven mass shootings—and a record number of casualties, with more than 140 people injured and killed.
Armed civilians attempting to intervene are actually more likely to increase the bloodshed, says Hargarten, "given that civilian shooters are less likely to hit their targets than police in these circumstances." A chaotic scene in August at the Empire State Building put this starkly into perspective when New York City police officers confronting a gunman wounded nine innocent bystanders."
More Guns, More Mass Shootings