Open this photo in gallery: From the left, Claudine Gay, president of Harvard University; Elizabeth Magill, president of the University of Pennsylvania; Pamela Nadell, a professor at American University; and Sally Kornbluth, president of the Massachusetts Institute of Technology, appear at a House Committee on Education and the Workforce hearing on Capitol Hill regarding antisemitism in schools, on Dec. 5.TOM BRENNER/The New York Times News Service Stand up Re “Canada’s ceasefire call ‘naive,’ has no impact on the war, says Israeli ambassador” (Dec. 14): Some people are asking: What does Canada stand for? The answer seems clear: the preservation of...