What Explains U.S. Mass Shootings? International Comparisons Suggest an Answer - The New York Times

When the world looks at the United States, it sees a land of exceptions: a time-tested if noisy democracy, a crusader in foreign policy, an exporter of beloved music and film. But there is one quirk that consistently puzzles America’s fans and critics alike. Why, they ask, does it experience so many mass shootings?....
https://www.nytimes.com/2017/11/07/world/americas/mass-shootings-us-international.html?em_pos=small&emc=edit_up_20171108&nl=upshot&nl_art=4&nlid=78638145&ref=headline&te=1&_r=0