You're automatically conflating tribal organization with the idea of forceful, coercive government. Tribes can exist, as you say, so that individuals support each other in a circle of trust with other individuals. But if you break that trust, well, they don't have to lock you in a cage, they can simply withdraw their support of you.
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Right but living in a place like California there are simply too many people to interact with to make reputation a viable option you can't ostracize for no central authority owns the geographic area