What's the point of the subjugation and supremacy laws currently? From the tutorial, it sounds like the subjugation path is supposed to be cheaper on housing vs tolerance. But... That's not actually true? High tier houses and residents are how you generate mana. And since subjugating ratkin costs more than tolerating them, that means you need more houses to pay for the law. Plus, whose going to be in those houses? Because it seems like the whole path is about making slaves more productive, and humans better at combat. Which leaves non-combatant non-slaves in a bit of an odd spot, but the majority of your population is going to be these people.
If it's supposed to be a moral choice, there needs to be an actual mechanical reason for picking the evil option. Like frostpunk and child labor. As it stands, I don't see why you'd ever pick the evil option here.