Apply logic.
They want to keep the gullible, so why would you kill them off, they are your main supporters?
The powers that be, both hate, and love, the masses. They NEED the masses, because they provide the, "legitimacy," of their positions, they provide the wealth, and besides, it's no fun being da king when you have no one to lord over.
It's probably nothing more than a distraction. They don't mind losing a few of their minions, as long as they remain safe. It's ALL about the top tier.