Or we could use the FBI’s def­i­n­i­tion of a mass shooting: one in which at least four people, not including the per­pe­trator, are killed. This is a vastly larger cat­e­gory than the one Maddow employs: there were about 600 such inci­dents in the United States between 1980 and 2010.  As James Alan Fox, a pro­fessor of crim­i­nology at North­eastern Uni­ver­sity points out, the rate of such mass shoot­ings does not appear to be rising. 


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