President Rodrigo Duterte's threat to withdraw the Philippines from the United Nations, later cushioned by his foreign secretary, is the latest flamboyantly irreverent utterance from a politician who has disparaged the pope, human rights advocates, the United States and other countries who controvert his worldview. His devil-may-care expletives against criminality, corruption and government incompetence helped him build a name as Davao city mayor before he claimed an overwhelming presi...