That's exactly what he was doing. He started with criminals, but when you stumble into that much power, your whole life eventually becomes about keeping it. I was one of the few people trying to stop him. Most of the others were too stupid to realize a war was even happening, much less that if he won, they'd all be little more than his slaves.

[It still makes him angry, always will, even though the good guys won and he's left that world forever.]

The witches here are more of a united front. I've only heard of one being willing to help humans and Shibusen.