“Lives are on the line,” President Biden said after the Supreme Court held New York state’s restrictive gun-permit regime unconstitutional last week. Gov. Kathy Hochul warned: “This could place millions of New Yorkers in harm’s way.” Brazil’s experience suggests otherwise.

In 2018, the year before Jair Bolsonaro became president, Brazil had one of the highest homicide rates among developed countries: 27.8 per 100,000 people, compared with 5 per 100,000 in the U.S. Mr. Bolsonaro’s solution: “Give guns to good people. Let people have guns so that they have the chance to defend themselves.”