Your argument is absurd. Sure, some caveman consumed alcohol that happened to occur naturally a gazillion years ago. So? You think huge factories producing alcohol and all the issues associated with it are justified?
By what you say, if whole of humanity consumed only naturally fermented fruit, I would half-heartedly agree.
> You think huge factories producing alcohol and all the issues associated with it are justified?
Humans also don't "naturally" need to be writing fictions, or draw pictures or make movies. And conversely, murder is pretty natural - take a look at how often it happens in nature!
Whether something is "natural" or not is a bit irrelevant - the big question is whether the action should be acceptable for humans to do. Drinking alcohol affects the person drinking it, but it gives them some comfort, or happiness. As long as they don't drink so much that it harms another person, i say they can do what they wish!
By what you say, if whole of humanity consumed only naturally fermented fruit, I would half-heartedly agree.