"Primitive" tribes uncontacted in Brazil

Primitive: Anthropology. A person belonging to a nonindustrial, often tribal society, especially a society characterized by a low level of economic complexity.


According to the definition above, the previously uncontacted tribe found in the Amazon is, by all means, primitive. After all, it was a small tribe of hunters and gatherers and any agriculture present was probably not very developed. But the negative connotation of the word primitive is far from being the biggest issue. What do we do with these people? Protect them? Leave them on their own yet exposed to violent farmers who crave for their land?
Both in the documentary clips and in articles regarding the topic, it is mentioned that initial contact with modern society often results catastrophic for the native tribes, be it either because of new diseases or because the "white man" shot the whole tribe down. Obviously when hearing about half of a population dying from a cold a normal person's first though would be that they need some sort of protection. Yet this protection would mean continuing to isolate said tribes and take measures so that no one encounters them, similar to the way one would protect an endangered species. This to me raises another question, what is it that gives us our humanity? Could it be our level of development? Would this mean that these tribes are infrahuman?
These questions to me, as absurd as they may sound, are vital to deciding a course of action regarding these people. Protecting them the way you would protect an endangered species would at a first glimpse seem reasonable, allow them to continue living the way they do and enclose them in a circle where no one will bother them, something like zoo. Except after looking at it in more depth it seems wrong, as well as impossible to do this. Perhaps development has reached a point where it is unstoppable and farms and industry will continue to grow and inevitably reach this tribes and probably exterminate them through diseases and gunfire. Perhaps it is better for the first contact to be relatively pacific, be in good terms with these people, and prepare them for what's in their future.