Open this photo in gallery: Indian Prime Minister Narendra Modi welcomes Canada Prime Minister Justin Trudeau upon his arrival at Bharat Mandapam convention center for the G20 Summit, in New Delhi, India, on Sept. 9.POOL/Reuters David Polansky is a Toronto-based writer. An old joke has it that the most boring possible news story would read: “Worthwhile Canadian Initiative.” And yet in the past two weeks, Canada has managed the surprising feat of making global headlines not once but twice, though by now its leaders may well wish it hadn’t. The first instance came when Prime Minister Justin Trudeau publicly accused...