Putting mass shooting deaths in perspective

According to the CDC, there are ~2.5 million deaths in the U.S. annually. In 2012, 151 of those deaths were due to mass shooters, or 0.00006% of all deaths or 0.009% of all homicides. So this rates as a major issue requiring large-scale deployment of resources and training...why again, exactly? The odds of being killed by lightning are about the same as that of falling victim to a mass shooter, yet we aren't talking about mass deployment of lightning rods across the nation.