The casinos on some reservations have had a positive impact. At least there is a good employer in the area for those wanting a regular life. In my opinion (as an outsider) the best thing for them is to go to college off the reservation.
You want to explain that, particularly the genetic component?
These studies are not really about one genetic condition that causes alcoholism, but genes or combinations that provide higher odds of immunity.
There is an a gene more dominant in parts of Asia that increases short term side effects for alcohol, reducing alcoholism.
Europe is suspected to have similar changes through genes that are less compatible with alcoholism dominating over others that might be better for most things, but not for the pickle that was the middle ages.
And no, it's not an excuse to give up on them, just a hurdle that needs to be overcome.
I volunteered with the Habitat chapter near there. They could not build on the res because any houses under construction would be stripped of their copper wire and plumbing before they could be completed. What they really need is a big employer to set up shop there: rising tide floating all boats, etc.