Muramasa
Best Girl
...It's Oriko. Kicking out is just asking for her to show up later as part of a convoluted scheme that racks up a body count.
If we confront her and she admits to attempted murder, refuses demands to explain herself/stop attacking people we're trying to keep alive, and shows every sign of continuing to do it, we're playing dice with the cast to not simply take her out of the equation right there.
Even Mami would've taken her out under those conditions. I'm saying we shouldn't become murderers without some real justification to do so. As of now, we don't. Not even with this. A confrontation needs to happen, I agree. Beyond that, it's really a matter of just how suicidal Oriko is.
If nothing else, we need to make it clear this kind of thing really needs to stop. We should have done this after Hitomi, if only to learn what Oriko's playing at.
We wouldn't have had any support if we confronted Oriko with just the Hitomi incident. Homura would've been preoccupied with Madoka and Mami would just look at us as if we had a few screws loose. Confronting Oriko alone is just asking for trouble.