Think you're simplifying it a bit. Some accidents happen because of drunk driving. Lots of accidents happen in the country because of poor roads, poor lighting, poor weather, dangerous driving of another sort etc. They also happen because people walk on dark country roads, either from some sort of necessity or riskyness.
I don't advocate intoxicated drinking in general but I think people in very rural areas need an option, that's just a fact of life there. You can't expect very isolated people to never go to the pub for a drink, nor can you expect them to just give up their homes. Some of those people are getting convicted for being a small bit over the limit, it may be the law but as we all know the law is rarely exact.