I realize I am not going to any friends saying this but:
In a free society you should be able to do anything you want AS LONG AS YOU DON’T HURT OTHERS.
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Yep, you should be able to drive drunk. Provided you are on your private property. If you crash you only hurt yourself or others dumb enough to be there.
However, once you go onto a public roadway, you become come under the jurisdiction of public laws. Laws, that for the most part, exist to do things collectively that the majority of us would do as individuals. If there were no police, and I saw you driving drunk on a public road, I and maybe a few others would join together and get you off the road. We would want to ensure the safety of the roadways for ourselves and our families. We wouldn't wait until you hit one of us to take action.
Instead, we get together beforehand and make up rules the are meant to mutually preserve our life, liberty, and property. Part of that consists of saying that we don't want any dumbasses driving around a ton of metal and glass while they're under the influence of something that disrupts their perception and reactions.
Or maybe I should be in favor of the freedom to shoot my gun randomly in a crowded area. As long as the bullets miss, I'm not harming anybody, am I? Why should anybody stop me beforehand????