[ He definitely has questions about Misa's past, but some of it he can fill it for himself, even without knowing her world. Whether it's as troubled as his own or not, it must be troubled enough for Misa to be willing to end the universe over it. More than that, Misa herself must have gone through something pretty awful to give it that nice, personally twist that would have someone clamoring to get their hands dirty in this fashion.

But that's too general to say he really understands her and her plights. And maybe he's wrong? She could just have a really unusual sense of right and wrong. ]

The Regent and their supporters seems strong enough as they are. Is there really a need to force the rest of Horos to bend to their whims? It'd probably be easier to go about their business in peace rather than cracking down on every little perceived slight. There isn't even a real reason the people of this planet would even have to know what the Regent's end goals are, right? It'd be easy enough to carry the plans out without having to quash any potential rebellions while keeping up trade between the other cities as needed.

[ Though as much as that might be true... ]

Hindsight is twenty-twenty though, isn't it?