SITTWE, Myanmar — The Buddhist monastery on the edge of this seaside town is a picture of tranquillity, with novice monks in saffron robes finding shade under a towering tree and their teacher, U Nyarna, greeting a visitor in a sunlit prayer room. But in these placid surroundings Mr. Nyarna’s message is discordant, and a far cry from the Buddhist precept of avoiding harm to living creatures. Unpro