It was more of a realization that those people placed far too much importance on their individual "purity", and their distance from the "impure" masses than effecting any systematic change.

When you think of the entire chain of supply and logistics involved in running the modern world, you are inexorably meshed with the world of evil and the "impure". As I said, it does far more good for ethical entities to take rein of this thrashing beast than to posture purity. You might even have to be cunning, brutal, and cold to ward off those who simply don't give a damn. Especially the psychopathic and sociopathic agents.