Well if we say that she's better than them and that we're giving them a chance because of Kyouko herself...I'm really not sure what to say here. Kyouko's clearly raging at herself more than anyone else because let's face it, this familiar farming cut a little too close to her. Not to mention they actually succeeded at killing someone intentionally whereas Kyouko only 'didn't save people'.
Any yet, these girls didn't get punished for their actions. They got off scott free, in Kyouko's mind, because of the mitigating mind fuck circumstance of Grey. That we're, hopefully, drafting them 'for the greater good' is, I think in Kyouko's mind, irrelevent. She WANTED them to get punished, if only to seperate herself from them. Clearly these girls will be dealing with the guilt of this, what they did to their friend, what their friend did to them and their actions as a group, for the rest of their lives, but Kyouko's not in any mood to care about that right now.
I mean maybe we could talk about how Sayaka herself doesn't forgive them for killing that man, but damn it, they're not irredemable so she's giving them a shot at redemption. Maybe talk about how Sayaka just didn't want add to her body count. Perhaps Sayaka saying that she forgives Kyouko for what she's done or just thankful that she never stooped this low would work. Then there's always the whole "Blame the System because fuck it" but I don't think that's the right track to go on at this point.
...Maybe we could even talk about how, pragmatically, we need their combat power for Walpurgis and if they die, well, at least it won't be by our hands(lol, IC, what's that.).
I dunno.