The punishment should depend on what the responsible party did. The injured party suffers without regard to the alcohol content in the blood of the responsible party. There are several non-alcohol related causes of automobile fatalities. These include but are not limited to old age, young age, lack of sleep, cell phone calls, and the weather. All may impair the driver's ability to avoid an accident.
None are punishable.
Neither should the level of alcohol in the blood of the responsible party. We do not advocate drunk driving. We advocate equal punishments for equal crimes. If someone is killed then the person responsible should be punished. The punishment should depend on the crime.