Stop fucking comparing Riona to Kyouko, they're on entirely different levels.
They're on different levels because they are on different metrics of power and experiences. The point being that, we give our friends a pass on the bad shit they did because we know
why they did it. And yet right now, people don't seem to be concerned with the fact that Riona
also has reasons to do the things she does. Okay, maybe Kyouko wouldn't full soul enslave people, but stop trying to make it so that Farming Familiars is some how so much more okay than Riona's powers. Arguing about shades of evil is not helpful here.
(This next part isn't directed at you, so much as the entire "Riona is morally reprehensible" position)
Once again, our friends are in order: Perhaps the most Morally upright Gucca ever (Mami), A literal white knight (Sayaka), and Godoka... and then a Familar Farmer (Kyouko), a thought policing mass murderer (Homura),
another thought policing murderer cum terrorist (Oriko), and an enforcer for the previous murderer who's totally down for leg breaking (Best Buddy). We haven't judged them for their sins. Why are we so gods dammed obsessed with judging Riona? Yes her thing may be worse, but not by much.
But Muh slavery is not an argument. By that definition
every magical girl ever is a slaver, because Grief seeds are people too. The entire system is horrendous, just because people are complicit with the system does not mean they are
responsible for the system.
And what about the problem of having to hunt a witch every four hours?
Does she have shades that can hunt for witches that she is able to maintain half way across the world?
I'll take "Obvious Applications of Riona's Power" for four hundred, please.