Well, that’s OP’s premise (which I do agree with). He says the U.S. spends 700 billion/year on defense, but needs less and that the rest is spent protecting other countries. There are 195 countries, so if that’s distributed evenly, we’re contributing about 3.5 billion/country/year, that they would each have to come up with if we stopped. Now, maybe it’s not evenly distributed like that - maybe Finland doesn’t rely on U.S. presence at all (but I think you, and they, would be surprised), but the point is that we’re indirectly subsidizing a lot of these social programs by providing military defense for a lot of these countries.
One interesting fact about Finland that I learned from "The Doomsday Machine: Confessions of a Nuclear War Planner" by Daniel Ellsberg is that in the event of a "general war" the US attack on the Soviet Union was expected to completely destroy Finland and kill at least 100 million in Western Europe.