Quote Originally Posted by Buffalobiian View Post
Tatsuya has already stated that he has no trouble taking out their aunt and the rest of the resisting Yotsuba. The only reason he hasn't done so already is because he won't be able to rule over them nor gain the acceptance of the other families with his current standing.
Yeah, and he's only certain he can do it because he's a fricking high schooler. Besides, that reason is as good as any preventing him from doing it. It also shows he lacks emotions that he states he could slaughter his own family yet doesn't do it because he couldn't control the clan afterwards. It's also quite possible the country would see him, and Miyuki, dead, if he toppled Yotsuba. Would he destroy Japan next, then? It's anything but an easy situation, and appropriately his mind of a robot will hold him back. Perhaps Miyuki would like to see especially his situation made better, but there's no easy way to do it. But there would be easy ways to make the situation even worse. Only in a very naive story someone too powerful is gladly suffered by the surroundings. Tatsuya's mere existence would make him no end of enemies if he made his real power known by destroying Yotsuba. And there's no way he could protect Miyuki from everything if enough enemies appeared.