On Friday, Jason Stockley was acquitted of first-degree murder charges stemming from the 2011 shooting death of Anthony Lamar Smith. Many of the people of St. Louis have responded to the verdict with protests that have turned violent. Mr. Stockley, who was a St. Louis police officer at the time of the shooting, was accused of premeditated murder almost six years after a high-speed chase ended with his shooting Mr. Smith, a black man, to death. Prosecutors further contended that Mr. Stockley planted a gun on the victim to make the shooting appear justified. Additionally, dash cam footage...