Dropping DMEs on a planet tend to destroy it outright, or at best, gradually eat through its core and at the very least, create a climate shift that would render a planet uninhabitable.
But lets say those problems do not exist, it does not change the fact that Wind has a lot, and I mean a lot of mess to clean up. So I agree with Matt on this, the writing is insufficientin in dealing with this 10 ton elephant in the room.
Moreover, the writing allowed Wind to simply get away with too much. By that, I am not even concerned about post-war responsibilities. I am more concerned as to how I had to suspend my belief to witness Wind fight a war with nothing, and actually winning!
In the original SDF, humans, being the underdog, tend to give it all when fighting the Zentradi, who, backed by superior force, were more or less dickin' around. In Delta, its the underdogs who are dickin' around!