So actually driving drunk is not like using the knife then?
Not at all. Unless I hit someone with my car.
Your using the same logic as the anti-gun lobby.
Because 100% of all gun fatalities are caused by guns, we should get rid of all guns. And because 100% of all alcohol-related vehicle fatalities are caused by drunk drivers, we should get rid of all drunk drivers.
Guns don't kill people, a very small percentage of gun users do.
Drunk drivers don't kill people, a very small percentage of them do.
Again, by arresting someone who has a BAC of .08 simply because he falls into a category of people who MIGHT end up hurting someone else is no different than throwing all black males between the ages of 14-24 into prison because they MIGHT (and are statistically much more likely to) commit a crime.