Did you even read the article you linked, OP?
This bucking of a global trend of cultural loss and disappearing languages has been accomplished by the innovative public policy of not initiating contact – which was pioneered by Brazil in 1987 after decades of government-led contact killed more than 90% of those contacted, mostly from disease. Since then, Peru, Colombia, Ecuador, and Bolivia have adopted versions of the approach.
Would it be 'moral' to risk the death of 90% of those contacted?
If you're out of line with all expert, charity and government thinking, you probably need to read a lot more about the topic before pronouncing your moral judgement.