Prove? Nothing at all. I don't care that others drink as long as it is in moderation and they aren't staggering drunks that suck up my time and money. I don't drink because it does not appeal to me. My father drank extensively when I was young - so much so that he would pass out in the doorway of my bedroom when I begged him not to leave the house in such a state. Growing up in a situation like that changes your outlook on alcohol and its effects.