Well, the old "isolationist" case for non-interventionism has always been in the service of "commerce with all nations", avoiding "entangling alliances" as far as practicable - so it's a bit difficult to differentiate it from either a "progressive left" or a "libertarian" POV. Intervention in WWI and WWII (in both instances, on the side of democracies) was rather broadly supported because the prospect of a world ruled by the philosophy of totalitarianism and military aggression was hardly attractive, even to quite a few "paleo" conservatives.