I don't know terribly much about alcohol, so take this with a grain of salt. I think I would probably put it as an out-of-date adaptation; my understanding is that alcoholic beverages would have been extremely energy-rich, and also hard to come by, and so is in the same category as sugars and fats - they are now bad for us though they used to be good. ('Superstimulus', I think, is the term.) Given that, it's more harmful than helpful and to be avoided. I'll admit that the issue of resveratrol confuses me. But assuming that it has any beneficial effect in humans, AFAIK one should be able to get it just by drinking grape juice - resveratrol is not created in the fermentation process.