...I never said he did.
Given the circumstances, I at least figure he'd rather stop them, than worrying about cleaning up. Obviously, it reached a point where cleaning wasn't his main goal at that point.
Plus, with a town in panic, Joe Everybody isn't going to be worried about a hole in the road, they were all trying to leave. He could have cleaned up later on and had plenty of time.
EDIT: Well, the military did show up, and we know what happened then - had they had shown up, and been able to contain it and win, that'd have f**ked Wolf pretty hard.