They may well have good reasons for being hostile to outsiders. Imagine 400 years ago they were friendly and approachable, but after a succession of whalers, sl

They may well have good reasons for being hostile to outsiders. Imagine 400 years ago they were friendly and approachable, but after a succession of whalers, slavers, British kidnappers and who knows what else, quickly came to the rational conclusion that outsiders are hostile and must be fought off. It would be more accurate to say that it is not a great advertisement for our more complex social structures to yield harmony.