[dmg8]

It sounds as if you're envisioning these people being painlessly integrated into modern society, perhaps retrained as plumbers, software developers, etc., then joining Brazil's (extremely small) middle class. This is just not realistic.

In practice, these people joining "civilization" would almost certainly mean ending up living in grinding poverty in an extremely violent "favela" (Brazil's ubiquoutous shanty towns) with drugs and guns everywhere.