I doubt that we would actually up our social welfare spending even if the other nations were spending 3% on military spending. Which is why I think bringing up Europe's social welfare spending is a red herring. It implies that our military spending allows them to hone these social welfare programs. It also implies that the 2 things are trade offs - either you have 2% of military spending or you have robust social welfare programs. To my way of thinking, making that implied connection is just more divisive reasoning. It leads some Americans to believe that Europe is essentially taking advantage of us. And that makes them our enemies, not our allies.