I get her beef with the Imperial family -- this first night goes to show they're likely all rotten -- but does she really have to collapse the entire empire? For the sake of ten innocent men, God would have spared the cities of Sodom and Gomorrah, I have to believe there are more than that in an empire.
Then again, she's a monster-infected being of vengeance sent back in time by God, so hell, maybe she really is the instrument of Judgement.