This isn't the jungles of Ecuador where native tribes interact and have at least some continuous contact with the outside world. Nobody comes or goes from this island.
These people have quarantined from the outside world for quite literally centuries. Which means that...
Whenever they encounter people from the outside they die.
Not metaphorically.
Not figuratively.
Literally. Their immune systems lack antibodies and helpful bacteria and all the things that keep the modern world from being killed by pathogens we encounter throughout our lives.
The things we survive don't all go away. We neutralize them, and then some of them we still carry around. In fact, some of them our children carry around too, but we pass many of our immunities on to them.
The Andaman tribesmen associate outsiders with dying, and you will note they moved the body to the sea while staying as far away from it as possible.
And every information source I have read about the Andamans in recent years lays all of this out.
This guy was no Jim Elliott by any stretch of the imagination. You are supposed to first do no harm.
How many people could he have lead to Christ after his very presence caused them to start dropping like grasshoppers in a blizzard?
So dying and being separated from God for all eternity is a better option? Got it.
Uh, Central Mexico in the 16th century. Estimates go as high as 80% of the native population died from a variety of new (to them ) diseases. Many I am sure considered the Aztec-Mexica in a more favorable light during this trip to hell. The fun filled Mexica could only manage to perform cardiectimies on a couple hundred thousand captives a year, max.