Anthony Lake WASHINGTON, Dec. 14 - In a pivotal scene in "Hotel Rwanda," which opens Wednesday, the colonel in charge of a beleaguered United Nations peace-keeping force rushes to talk with the commanding officer of a fresh and heavily armed United Nations contingent that has just arrived at a hotel packed with refugees from the bloody genocide outside its walls. The colonel, played by Nick Nolte, suddenly throws his blue beret on the ground in anger. The eyes of the hotel manager, played by Don Cheadle, slowly register concern, then fear. The awful truth becomes clear: the new soldiers...