I've seen a documentary where they contacted one of these tribes. They were living a rich life in the jungle actually and were happy and never hungry. They didn't even have clothes. they were pretty much naked. Some missionaries decided to feel sorry for them and 'help' them. They gave them clothes, sodas, junk food and other staples from civilzation and led them out of the jungle into civilization. You know what happened? They went from a rich happy life in the jungle to living in abject poverty in south america. No money, nothing. it was horrible. That is when I realized that indeginous people should be left alone. And if people want to spin it that leaving these people alone is "treating them like animals on a reserve" or whatever then so be it. Those people lived a happy life in the jungle and were well fed. When they came out of the jungle the suffered living in 3rd world slum with no food and no money and no clue how to make money. Horrible. I think the best thing to do is treat them as natural living beings that are living in their natural habitat on the brink of extinction and we should just leave them and their habitat alone. There are no fruits from our civilization that they can benifit from at this stage. They definitely can't benifit from a third world slum.