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.

Among other things, Biden wants Congress to require background checks for private gun transfers, which means such transactions must be completed through a federally licensed dealer. The Times found that four of the mass killers in the 105 cases it examined bought guns in private transactions.

One of those perpetrators had already failed a background check. One of the other three, the Violence Policy Center reports, “legally bought” a pistol from a gun shop. According to a 2013 review in The Atlantic, it is not clear whether either of the two other killers had disqualifying criminal or psychiatric records.

In at least one case out of 105, then, an expanded federal background-check requirement might have been an obstacle. But that’s assuming private sellers generally would comply with that mandate, and data from states that notionally require “universal background checks” suggest such rules are widely flouted.

The Times found that at least 20 mass murderers used magazines that held more than 10 rounds. The 1994 federal “assault weapon” law, which expired in 2004, prohibited the production and sale of such magazines, and Biden wants Congress to renew that limit.

Even if we assume that the need to switch magazines after firing 10 rounds can make an imp