This is BS. The article isn't condoning chasing antelopes in the savannah. It is against genocide. Just because your civilisation is more advanced (whatever that means) does not mean that you should simply murder and wipe out the other civilisation. You can live side by side and allow the others to learn from you and interact with you, etc. If there was no genocide, the US will probably be just as advanced as it is now but would have much more native Americans. In fact it would probably advance faster because in the beginning shortage of people was the main thing slowing down the US advance. If native Americans were free to join the American population, the population would grow much faster.