Large organized groups of people that follow rules and laws that are publicly known are not gangs - you have all the information you need to successfully interact with them available. There is no arbitrariness.
Where that is not true, then you are right. But going back to what you said: if you only consider self-governance the correct thing, then it can never be true for anything. Therefore you would never have large organized groups of people, which are necessary for things like the Internet you're using to read this right now.
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