Those tribes of Andaman-Nicobar, who have no contact with the outside world, why is it dangerous to bring them into the mainstream?

In 2018, an American tourist was allegedly murdered by a tribal group of Andaman-Nicobar Islands. The Sentinelese tribe is considered one of the most untouched communities in the world, which has no contact with the outside world. There are many other tribes in Andaman-Nicobar, which have been living in isolation. Now efforts are being made