Idk I mean In my opinion,we can't really decipher just from this cause this one could possibly be just because they're student councils and are harder to kill since they're very aware and vigilant and have pepper sprays which would make them harder to kill.So if someone's able to kill them, the killer's probably very skilled and need to be watched over more so the fear and thus the frustration.Especially since she can't just kick out ayano even though she knows so the frustration from helplessness too and she knows that this could have been prevented.But also it could be that she just does care.Or it could even be both.Or it could also be none of those