You're not talking about the whole world, only one aspect of it. Maybe you meant to say "all else equal", but all else is not equal: people are suffering because of alcohol that wouldn't have suffered without it. Are you saying that's unimportant compared with people's freedom to consume wine? Are you unwilling to trade freedom for happiness on principle, no matter how many units of happiness people get for relinquishing one unit of freedom? Or is there a calculation behind your reasoning?