Earth & Conservation

What Is the Leading Cause of Mass Shootings in the U.S.?

A look at what the 2015 data reveals

This video from GOOD Magazine takes a broad look at mass shootings that occurred in the U.S. in 2015. Per data from, there were 330 mass shootings last year -- meaning, 4 or more people, not including the shooter, were killed or injured in a single gun-related incident. As these shootings happen more and more often, there's always the major lingering question: Why? What caused such an act of violence? Here's what Shooting Tracker found: