In the era of governments with ubiquitous electronic mass surveillance, complete control over all communication channels, and autonomous suicide drones, humans can't revolt either.
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".