Open this photo in gallery: Anthony Rota leaves the speakers entrance of West Block after announcing his resignation as Speaker of House of Commons on Parliament Hill in Ottawa on Sept. 26.Sean Kilpatrick/The Canadian Press The damage wrought by the spectacle of Canadian parliamentarians and Ukraine President Volodymyr Zelensky unwittingly applauding a veteran of Adolf Hitler’s war machine will not easily be remedied. The belated resignation of Speaker Anthony Rota is the start, but cannot be the end, of that process. Canadians, Mr. Zelensky and our allies deserve a formal apology from Prime Minister Justin Trudeau and a full accounting...