My pet theory is alcohol helps us build and maintain relationships. And whilst even a little alcohol harms us, the physiological benefits of having a strong social group out weigh that harm.
Are you sure you’re building anything foundational if you need to be drinking for it to occur?
Yep, try it some time. Believe it or not, reducing inhibitions helps build close friendships by making is easier for people to get to know one another. Who could've guessed?!?