I am familiar with the problem. On the main road right outside the reservation there are shops selling beer.
People drive there, fill up the car, and drive home often intoxicated. There are accidents on the road, and often in the winter they freeze to death walking home from the party near their house (it gets 30 below there).
The idea is if they had to drive to the city to buy beer, there’d be fewer deaths. I’m not sure if that’s true, but there is a place in hell for people who make lots of money selling beer to alcoholics.
It's right next to the place for those who build casinos for gamblers, and sell tax free cigarettes to smokers.