JERUSALEM — A long line of international dignitaries have paid visits to Yad Vashem, Israel’s official Holocaust memorial in Jerusalem, and President Biden’s visit on Wednesday was not his first. As vice president in 2010, he toured the site’s Holocaust History Museum, Hall of Names, Children’s Memorial and Hall of Remembrance, where he participated in a memorial ceremony, and where an eternal flame burns by a crypt containing the ashes of Holocaust victims, commemorating the six million Jews killed by Nazi Germany and its collaborators during World War II. Back then, Mr. Biden spoke movingly of how, as a young...