While attacks like that are absolutely a massive and terrible problem, I think that problem is orthogonal to my original question. Those victims are also tallied under general violent crime and murder statistics. When trying to determine whether legal gun ownership is a net positive or negative to society by comparing stats across states, it makes more sense to compare general rates. Presumably gun deaths will be lower in states where it's very hard to legally get access to a gun. But does that matter if far more people are being murdered overall in those states even with mass shootings occurring in gun-friendly places like FL & NV? Chicago sees more people shot and more people murdered each month than any single mass shooting.