Read some Hobbes. This is why the state SHOULD exist because a self enforcing community that checks against abuses doesnt scale beyond a few hundred people. We begin to lose interest in our neighbors when there are too many of them.
It’s true…honest communities tap out at a little over 150. Why is that? Because after that people become anonymous…which is to say beyond that number, everyone can’t know everyone else. As soon as that goes people start lying and stealing and doing other corrupt stuff.