An article from NPR admits the following about "school shootings:"
Like the Ball State study, Alathari emphasizes that targeted attacks of this kind are extremely rare. The new report excluded attacks that seemed to be related to drugs, gang violence or disputes that merely spilled over onto school property. They were left with an average of four shootings or stabbings per year across hundreds of thousands of schools, and the report found no upward trend in the frequency or severity of attacks over time. That's yet another reason, she says, to focus on prevention efforts that can improve the school climate overall — whether or not the worst-case scenario happens one day.