"We now know of one reason why the general was so favored, at a time when he had made himself—and his patrons—responsible for the grossest war crimes and crimes against humanity. In April 1971, a United States ping-pong team had accepted a surprise invitation to compete in Beijing and by the end of that month, using the Pakistani ambassador as an intermediary, the Chinese authorities had forwarded a letter inviting Nixon to send an envoy. Thus there was one motive of realpolitik for the shame that Nixon and Kissinger were to visit on their own country for its complicity in the extermination of the Bengalis.... It cannot possibly be argued, in any case, that the saving of Kissinger’s private correspondence with China was worth the deliberate sacrifice of hundreds of thousands of Bengali civilians."
January 1, 1970
https://en.wikiquote.org/wiki/1972_visit_by_Richard_Nixon_to_China