When considering surveillance as a means of controlling a society and preempting insurrections or acts of political violence, we should consider that the animal body does not contain a surveillance system to monitor all of its cells that is so comprehensive that all threats can be avoided.
Mechanisms operate with which to guide and instruct the behavior of cells (hormones and the nervous system), and crude mechanisms exist with which to be alerted to problems in troubled parts of the body (pain receptors). Channels of communication are set up, sufficient to reasonably satisfy the needs of the system as a whole. Beyond this, though, cells are given broad latitude to carry out their duties. Cells are not individually observed and monitored by the brain. The brain does not keep archival records of every interaction that one cell has with its neighbors. It is simply not feasible to constantly monitor the mundane goings on of every cell - nor would it likely provide more benefit than cost.
Now it is true that by not being acutely aware of the minutiae of every single cell's daily life, the body may fail to avert certain life threatening crises before they become too overwhelming to contain. Bacterial infections can blaze beyond control and sepsis can take hold. Cancerous cells can organize into a fatal insurgency against the body. Cells can be hijacked by surreptitious viruses and persuaded by their trickery to replicate their viral brood and speed their infiltration of the host. Yet in spite of all these risks, evolution has not gone in the direction of extreme surveillance. The overhead cost would likely represent a competitive disadvantage for such an animal when compared with other animals.
We should consider then, that the overhead cost of creating a completely safe and airtight police state, where all individuals can be monitored for suspicious activities at all times, would provide a competitive disadvantage for such a society when compared with other societies. Were police state idealogues prepared to simply set aside their ideology for a moment to do a cost-benefits analysis, they would learn that the costs outweigh the benefits. Sometimes you just have to retire your obsessive compulsive desire to keep everything neat and tidy, and instead learn to tolerate the messiness that necessarily comes with pragmatically governing a society made up of hundreds of millions of crazy human beings.
It is also worth reminding oneself that some of the greatest threats to the human body are hatched within the human mind, and it is often the brain controlling the body that could do with more monitoring of its activities than the lowly peon cells that comprise the body. So, instead of the government being more keenly aware of what its citizens are up to, it might be better for the citizens to be more keenly aware of what their government is up to.