My question was posted in the context of its thread. Specifically, the figures we were discussing were about "gun related incidents", not mass shootings; the OP took the time to explain that these included things like brandishing a firearm or bullets striking school property whether or not there was a shooter on the property or someone got hurt. I would expect these sorts of incidents to happen more often in more violent communities; mass school shootings seem like they follow a different pattern than other kinds of gun violence.