If everything you say is really true, the native population would have long ago become extinct. They managed fish and wildlife just fine before Europeans came here. They didn't exploit the resources like our society does now. There were no corporate entities to muddy the waters or control essentials of life. Natives harvested all they needed to survive and allowed the rest to reproduce for future years. Our commercial interests know nothing about natural balance of things as well as most of modern civilization. Corruption and greed comes with wealth and power and our society has plenty of excess in both areas right now.