would you give a 5 year old a beer? no? exactly. everyone knows drinking is bad for you. they do it anyway, because "reasons" [1] anyone who disagrees is just being irrational. [1] which may include partying and hooking up, as well as removing any awkwardness they have.
Yes, we know that alcohol is generally not great, but that doesn't mean there's no value in quantifying what "not great means". What was the point of your comment exactly? You sound like a bitter old man who never got invited to parties.