As the NYPD mourns two of its own, Mayor Bill de Blasio pleaded for a pause in protests and rancor amid a widening rift with those in a grieving force who accuse him of creating a climate of mistrust that contributed to the executions of two officers. De Blasio called on Monday for a halt of political statements until after the funerals of the slain officers, an appeal to both sides in a roiling dispute centered on the deaths of unarmed black men at the hands of white police officers.