In other words, people don't revolt, warlords revolt. Warlords in control of weapons which are decreasingly reliant on humans and increasingly reliant on remote and autonomous technologies. A drone swarm is not "the proletariat in uniform".
Every rifle takes one person to wield it; one more person that might decide to turn that rifle against the ruling class. A drone swarm is worth ten, a hundred, a thousand, ten thousand people with rifles, capable of being controlled by one person issuing high-level kill orders. The tyrants of the future won't need to risk arming "the proletariat".