Earlier quoted context omitted.
To cut it short, I think a tiny amount of alcohol can be a superb bargain. It allowed me to stay a bit neutral in parties (instead of crippled by anxiety and phobia). And being around people, even like a wallpaper had strange positive effect on my moral. I don't know if doing that long term (even tiny amount of beer) would harm your body, but having zero social life is also very very damaging.
Well, we are social creatures. Even the most introverted of us (finger points at self). So no surprise that being around parties/other people has a positive effect on moral. The health benefits of the social contact almost certainly outweigh the negative health impacts of a tiny amount of alcohol.
Thomas Szasz has some books about drug history and the paths that turns a substance from legal to illegal. It only takes a high level guy to find the usage, made up some "facts", and illegalize it. Sadly, society is quick to buy those lies. E.g. someone claimed that some guys on LSD stared the sun for too long and got blind. It was a hoax, but so many media repeated the story that it got ingrained in the society that LSD is highly dangerous.