[quote=Asura]Cinder was once a 'good guy', but turned on Vale/Beacon/Ozpin following Summer Rose's death, which she likely had a part in, be it as the aggressor or a colleague present at the time. Callin' it now.
[/quote]

I could see that. Probably was a colleague rather than the aggressor there, and she sees Summer's death as the fault of Vale/Beacon/Ozpin for whatever reason, so she's trying to bring down the 'corrupt' system. Or something like that.