I hate trying to make distinctions in levels of legal consequences for drunk driving... It lowers your judgement and inhibitions at the same time it's horsefeathers over your motor skills and reaction times, so you do stupid horsefeathers you normally wouldn't even do when you're sober. The punishment needs to be severe enough for ANYONE over the limit that it deters driving "cautiously" a little over the limit, because that breeds false confidence in the future and is exacerbated by the aforementioned impairment of judgement, leading to 90 in a 35, passing multiple cars at once on a 2 lane highway, etc