People and countries can change. And people and countries DO change. I think the lesson I've learned from my safe distance these last 20 years is that it is hard to influence the direction in which this change happens, even with the expenditure of blood and treasure. Oh, you can stir shit up, but there's no knowing how it will settle.
[incidentally, it really isn't clear to me why this sort of thing seems to have worked well for the de-nazification of Germany and pacification of Japan]