There's a lot to unpack here and like any complex system, there's a lot of history behind why things are a certain way. All of the following are likewise extrem

There's a lot to unpack here and like any complex system, there's a lot of history behind why things are a certain way. All of the following are likewise extreme simplifications of a messy reality. 1. Historically the reservation system evolved as a way to control and corral indigenous peoples. It continues to continues to exist today largely because natives want it to exist and there aren't any better solutions. It gives them the ability to form their own governments, own their own land, and have their own quasi-sovereignty. They're (nominally, not always practically) free to leave reservations whenever they like and many do. 2. The US had a couple centuries where the official policy on native peoples was "integration". These years are widely regarded as constituting something called a "cultural genocide". Suggesting it as a policy comes across... badly. 3. Pretty much everyone involved recognizes that logic has very little to do with the whole affair. It's a complicated mess with a lot of sensitive areas, and more competing interests than you can possibly imagine.