You are missing the MAIN factor: the belief in "authority."
I am not missing it. Belief in authority is there, always has been, whether that is a node from a miner or a legal document from your state collective.
If a PRIVATE security agencies made a habit of committing unjust aggression, and the people did NOT view them as a rightful "authority," that agency would be out of business (or dead) very quickly.
Well, same applies to governments. If it was too much they would get overthrown. Happened plenty of times in the past. People have a special connection with oppression and authority. Almost like a Stockholm syndrome. It happens to relationships, companies, governments, anywhere really. Heck, people even beat their dogs and girlfriends but they come back to them.
There are far greater mechanisms embedded in our nature my friend. The state vs private dichotomy is massively flawed.