As the Stanley Cup holders opened their title defense amid a euphoric home crowd, the silence about the Patrick Kane rape investigation was deafeningYou couldn’t miss the protest Wednesday night on Madison Avenue in front of the United Center, where the Stanley Cup champion Chicago Blackhawks were about to open their season and raise their championship banner to hang in the rafters.The entire offseason for Chicago was marked not by celebration, but rather by the scandal of monstrous allegation: Star player Patrick Kane, the face of American hockey, was accused of rape.