User blog comment:Theory of everything/The Renard Mystery/@comment-72.93.214.207-20120205045714

I think that maybe Renard is a rouge grimm of sorts. Grimms often view all creatures as monsters to be killed, and Nick's different treatment of them seems to be an ongoing theme, so maybe Renard also thinks that the grimms killing all the creature is brutal, unfair, and makes them the real monsters, so he joined the reapers. This would explain why he order aunt Marie's death, but still tries to protect the similar minded Nick.