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.
A ‘Two-Speed’ Europe?
Splitting the European Union into separate "achievers" and "laggards" clubs may not be a good idea, but it may be inevitable economically.