Michael White didn’t deny killing Sean Schellenger. He admitted to police and at his trial that he plunged a knife several times into Schellenger’s back during a July 2018 scuffle in Philadelphia’s Rittenhouse Square. Numerous witnesses and a cellphone video confirmed what happened. Yet in October 2019 a jury acquitted Mr. White, a 22-year-old college student, of voluntary manslaughter. Many, including the victim’s family, blame Larry Krasner, Philadelphia’s soft-on-crime district attorney. Mr. Krasner is one of a new crop of “progressive prosecutors” who have won election in liberal cities. They include San Francisco’s Chesa Boudin, who was raised by Weather...
