Just summing up the paradigm of needing to control the masses by preventing people from doing things that people will inevitably do. You can't stop people from talking.
You can stop people from talking publicly.
People will break and do harm to others, but having a vehicle to know what that harm might be in advance is invaluable.
Society would be much easier to control if we simply kept all the people in cages and let them out occasionally to work for the good of the people. On the other hand, it wouldn't be much of a society now, would it?