It’s not just that every other high-income country in the world has many fewer guns and many fewer gun deaths. It’s also that U.S. states with fewer guns — like California, Illinois, Iowa and much of the Northeast — have fewer gun deaths. And when state or local governments have restricted gun access, deaths have often declined, Michael Siegel of Boston University’s School of Public Health says.
“The main lesson that comes out of this research is that we know which laws work,” Siegel says. (Nicholas Kristof, the Times columnist, has written a good overview, called “How to Reduce Shootings.”)