Same thing around here up until a few years back....
I live next (about two miles) from a reservation in Western NY where basically the same type of thing would happen all of the time. Sadly, people used to talk about not wanting to drive down certain roads during the weekends because we might find "speed bumps" in the road (drunk Natives). Harsh, but it really used to be like that. There used to be many alcohol related accidents and deaths on the reserve. There really was almost no future at all for most of these people, and that causes a lot of depression and alchololism, as well as other things, as you know.
About twenty some years back the natives started selling cigarettes and such on the reserve, and it really becamed a landfall. In recent years, they have opened a few Casinos in the area. It has helped tremendously. The difference between twenty years ago and today for them is night and day. Finally, they are getting some uppance that they deserve. There's still a high incidence of alcohol abuse comparatively, but not anything like it used to be. And they certainly aren't poor anymore. It's made their lives a lot better.
Do they not allow this kind of thing on the reserve in South Dakota? Cigs, casinos? It sure would help with employment and an overall better life. Sure, they are vices, but most people can handle them just fine (yeah, cigs are bad).
If your nose runs and your feet smell, you were built upside down.