I'm not looking for an excuse for Moore. Although sometimes my politics align with his, I mostly think he's an ignorant loudmouth.
It's people like these that force our political dialog into the toilet.
That said, I don't really see him as rejoicing as much as snarkingly suggesting it was evidence for God. Obviously the side point is that it is dampening the RNC. He did say he "certainly hopes nobody is hurt." So if your going to suggest he was glad about the damage or the harm, you should review that tape. I saw it on Keith Olberman and Keith did give him a look like "Don't go there", but he did.
Would the Focus on the Family people rejoice if the rain had come?