Here’s a frightening list: every month there has been a shooting of multiple people in the U.S. Of course not all are “mass shootings,” but many include the words “open fired” and were at places—like nightclubs, restaurants, NBA games, parties—with crowds: http://www.bradycampaign.org/xshare/pdf/major-shootings.pdf.
Alcohol Increases Aggression; No Drinking Required
French researchers confirm that alcohol-related cues increase aggressive thoughts and behaviors, even if one hasn’t actually imbibed.