User blog comment:Zathronas/Analysis by an author: Volume 2 episode 9: Search and Destroy/@comment-10390252-20141003134556

I'm increasingly sure that Cinder or her sponsors may be some kind of cultists who think that the Grimm are somehow right in wanting to destroy humans and the Faunus and they are trying to facilitate this. How?

1) Encouraging the spread of dark emotions and behaviour by crime and creating worse levels of conflict between humans and faunus, thus creating more Grimm;

2) Making the kingdoms vulnerable by whittling down their defenders (by the aforementioned crime and conflict) and by disabling (by way of the Black Queen virus) their automated defences.

I should add that my theory is that the Grimm are not just attracted to negative emotions. They are human and faunus darkness manifest by way of aura-energised Dust. Just as the light of Aura is the most potent weapon that can be used against the Grimm, dark aura, the energy created by negative emotions, creates new Creatures. So, the current downward spiral of hate, envy and violence in Vale is creating an army of Grimm that just need to wait for the walls to come down.