There are two reasons for a violent reaction like this, only one of which relates to your relationship with alcohol.
Alcohol is indisputably an addictive poison and for many people a giant net-negative. It can be hard to admit this because everybody does it and it feels good at the time. For example, I've recently concluded that I shouldn't have alcohol.
But that's a decision that I am making for myself. It's a very different thing to make that decision for everybody in a society, and I think it's the imposition of someone else's values on your your personal choices that can provoke a reaction like this.
All that to say, I wouldn't assume that it's the person's relationship to alcohol that makes them feel like we shouldn't make laws like prohibition.
Bingo. We've done Prohibition. It didn't work then. It hasn't worked with the War on Drugs. A neo-Prohibitionist is either ahistorically stupid or trying to distract.
DUIs should be treated more seriously. First time, warnings and the blow-y thing. Second time, multi-year license suspension and a month in jail. Third time, license revocation and multi-year jail time.
But alcohol as a whole is a drug with deep precedent and broad integration into socieety. If you want to reduce its use, tax it, message on it and give more people other things to do with their time and money.