Dozens of news outlets reported that America has the most mass shooters in the world. Many say that shows America needs more gun control.

CNN claimed that “the U.S. has the most mass shootings”. The WSJ reported that “U.S. leads the world in mass shootings.” Nearly every major media outlet and former President Obama said the same. But the claim is based on just one study, and the author of that study, Adam Lankford, would not release his data to other gun reseachers in the field. Economist John Lott argues that Lankford’s study has many flaws.

How a Botched Study Fooled the World About the U.S. Share of Mass Public Shootings: U.S. Rate is Lower than Global Average
https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3238736