Just think: A life without the damage wrought by modern antibiotics, dentistry, surgery, and preventative medicine! Where if you get sick with something that a week's worth of pills would clear right up, you're gonna die in pain! Paradise! Yep, nothing quite like the Noble Savage, who has the dignity to die of something you've only heard about in old novels.
https://news.ycombinator.com/item?id=6069163
Especially the answer to "But could this be because they don’t see the benefits of ‘our’ way of life? If they knew, might they want to join us?"