live the indians alone! don't buy their art, don't educate them in western institutions, don't treat them in western hospitals, don't involve them in western justice. leave them the way we found them: illiterate, warring, slaving, misogynist cultures as primitive as pre-assyrians. 
thousands of years and they cant build a boat bigger than canoe, a house bigger than a long shack, no codified law, no written language, primitive social interaction, a crappy diet, and bad craftsmanship.