I’m really not sure it’s not both/and rather than either/or. Getting drunk and being stupid seem so intertwined that separating the strands is more than a Gordian Knot.
At any rate, the latest ‘drunks are stupid’ exhibit is this Priest (!) arrested for drunk driving who in his stupor rambles more than an angry Mennonite:
Kids, don’t drink and drink… it just makes you stupid or proves your stupidity or both.