Because allowing that creates a risk of the birds being hunted just for feathers. Being native doesn’t automatically make them some mystical group of people that watch over the land. It’s a group of people just like any other group of people. And when you get a group of people inevitably you’ll get assholes. And in this case those assholes will decide to shoot birds for feathers and sell them. Where I am we have different tribes fighting for and against coal mining on their lands. Some see dollar signs some see protecting nature.