Would These 4 Gun Controls Prevent Mass Shootings?

The New York Times reckons that four gun control measures Congress is considering "might have changed the course of at least 35 mass shootings" since 1999—one-third of attacks in which a gunman killed at least four people. 

While that conclusion is excessively optimistic, the newspaper is at least asking the right question: Are new restrictions on firearms likely to work as advertised?

President Joe Biden, by contrast, simply assumes the wisdom of the policies he favors and the bad faith of anyone who opposes them. "The issue we face is one of conscience and common sense," he insisted last week, implying that skeptics lack one or both.