The pandemic has slowed much American police work, but police are still working. “As of May 17, 375 people had been shot and killed by on-duty police officers in 2020—about the same rate as other recent years despite the coronavirus pandemic,” Wesley Lowery, who helped track killings at The Washington Post, observed on Tuesday. Just a day before, a 46-year-old black man named George Floyd was killed by a white Minneapolis police officer who pinned him to the ground, kneeling on his neck for five minutes. Floyd’s last words were captured in a video on Facebook: “Don’t kill me” and...