Hopeful people are more easily controlled, but the volume must be managed. Too much hope leaves a person emboldened and resistant. Too little leaves them disabled and useless. But just the right amount of hope subjugates them. They cradle it like a dying ember, and they'll do anything to keep the wind from extinguishing it. They'll serve.
Control and manipulation are not love, the outcome is a life of imprisonment ultimately leading to deep-rooted feelings of resentment.
When the people are not enlightened enough to exercise intelligent control, you take it from them, not to command their lives, but to create a safe depository for the ultimate powers.