Before Henry Kissinger, who died at the age of 100 on Wednesday, became the most powerful and morally bankrupt secretary of state in modern American history, he was part of the 84th Infantry Division that liberated the Ahlem concentration camp on April 10, 1945. Among those who were rescued was my grandfather, who was likely hours away from death when Kissinger’s infantry arrived. Days earlier, the Nazis had marched most of Ahlem’s surviving prisoners to Bergen-Belsen, but my grandfather hid in the tunnel where he had been forced to chisel rock for 20 hours a day. A small crew of...