Earlier this month, American John Allen Chau was apparently killed by Sentinelese tribespeople on a remote island in the Bay of Bengal where they have lived relatively undisturbed for tens of thousands of years. Chau was motivated by a singular missionary zeal, writing in his diary, "Lord, is this Satan's last stronghold where none have heard or even had the chance to hear your name?" It seems he was willing to break the laws protecting the islanders against encroachment and