In the ongoing effort to get control of the city’s streets, Mayor Lori Lightfoot staged a news conference last Friday that was meant to make a statement. Standing on a platform in Olive Park, offset by a sapphire Lake Michigan on a topaz-sky day, the Magnificent Mile’s skyscrapers served as backdrop. Aldermen, clergy, federal and state law enforcement officials all stood as socially distanced props. Lightfoot even invited Cook County State’s Attorney Kim Foxx to stand within shouting distance of her new police superintendent, David Brown. Days earlier, Foxx had called out Brown and Lightfoot for “dishonest blame games,” after...