You might not like that law, and that's fine
You do?
Good question. It's only now I realize that I don't know nearly enough about the Tiers to tell you whether the reign of Kyros would actually be an improvement or not. Now, I haven't played Tyranny in a long time, so that might be part of it, or it's deliberately left vague in order to lend credence to the idea that Kyros' invasion being for the better.
Generally, though, I believe in principles of self-governance and nationalism, so me as a person would likely be opposing the invasion to the best of my ability, as the men of Stalwart (man, I fucking hate that section for what it is unless you've already betrayed Kyros, it's such a fucking wreck unless you're playing some kind of asshole psycho). But as a matter of principle, is the practice of Disfavored for the better? Yes, absolutely. The reasons I'd be opposing the Disfavored would be on entirely different grounds than contempt for their methods, and if I absolutely had to (just like the Disfavored), I'd probably employ the same laws. This doesn't mean that I'd
like it, though.
So would I
like the law? No. Would I still enforce it in that situation, with the benefit of all in mind? Yeah, probably, unless there's some extenuating or extreme circumstance that would make me act otherwise.
If I were to invade Kyros' empire, I'd want something like the Disfavored at my back in order to end it quickly, employing the same logic they do, and making sure that the rule of law is cemented and order restored swiftly and mercilessly. Strategically, something like the Scarlet Chorus could serve a vital role in such a conquest, but if I had to choose, I'd still opt for the methods of the Disfavored.