I'm sad because the opportunity to study and learn from a unique human culture and society is being lost and that officials representing the Brazilian government seemed to actively block attempts at further study - which was the point of the documentary.

I also somewhat fear, from what was shown in the documentary, for their future as in many cases, suddenly introducing a more modern/western way of life to an isolated people often seems to result in social breakdown.

I believe it's best to err on the side of caution in cases like this when you are interacting with a complex delicate system.

While I would consider myself a western liberal, fully appreciative of the benefits of a western scientific education and the use of modern technology to improve human existence, I would still expect great sensitivity when introducing such benefits to a people like this.

I'm not a relativist generally but in this case, the absolutist belief that these peoples' lives will be improved by exposing them to a modern education and technology reminds me that missionaries also had an absolute belief that introducing such people to the Bible (for example) would "improve" them and we know that the results were mixed in the latter case.