Why human civilization may owe its existence to alcohol

To some people, alcohol is a scourge on humanity that can do no good. It's true that booze is directly and indirectly responsible for many pitfalls in society, from drunk driving to increased risk for cancer. But what if alcohol was not merely a vice, but one of the triggers that sparked the dawn of human civilization — in essence, the very thing that shifted us from hunter-gatherers to agrarians?
This is a provocative thesis, and one that might upset Puritans. Yet it has some serious adherents, including philosopher Edward Slingerland. Singerland believes alcohol may have helped shaped human evolution from the very beginning and continues to have positive benefits for society — beyond providing a socially acceptable form of euphoria.
Why human civilization may owe its existence to alcohol