Earlier quoted context omitted.
Not quite as taboo as many other countries [1], unfortunately. You give two excuses to drink and drive. Both are indefensible. The first excuse is "need a car to get around, have car". I live in a sparsely populated area as well, and everyone uses a car to get around. When we go out drinking, we plan ahead. The most common options are designated drivers, taxis, sleeping over, walking, or cycling. The second excuse is…
Walking and cycling are going to get you killed at the same rate if not higher as driving. I guess you're not as likely to kill someone else.
I think this is best demonstrated by the minimum liability insurance required to operate a car. In California, right now, you can drive a car with only $35K in liability insurance... which is crazy. Sure, that will cover most cars, but it won't even cover a moderate injury. Very few people have the assets required to pay for a serious injury, and therefore, the victim is usually under-compensated.
Right now, cars are essentially being subsidized by the people who are getting hurt who get under compensated, because few people have enough liability insurance (or assets) to cover the cost of really hurting someone. If the injuries per mile were better factored into the cost of driving (which could be done by increasing the liability insurance minimum) driving would be a lot more expensive; quite possibly, once you factor in injuries, other, safer forms of transport would start looking practical.