Anyone that believes “indigenous people” were and still are a symbol of virtue are complete morons. These tribes were nomadic in their constant quest for food and shelter. Sure they didn’t have modern tools, equipment, and chemicals with which to do environmental damage but you can’t tell me that one or two of their campfires didn’t get out of control and burn out entire forests and grasslands or divert water from streams and rivers changing the ecological balance for the few weeks or months they were there before moving on.
What about all of the animals that went extinct prior to European settlement. If it looked like they could eat it, I bet they did.
The Plains Indians were also nomadic because the area around their villages became toxic from their garbage and waste, so they had to move or die.
They simply weren’t smart enough to have the necessary sanitation services.