Comment: So lots of different gangs

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In reply to comment: That's correct. (see in situ)

So lots of different gangs

emerge who don't respect anyone's opinions, and the people who "don't believe in rulers" have to form a gang to defeat these little gangs. Since they have to form a bigger gang in order to beat the little gangs, it needs rules, structure, hierarchy, constitution, as well as the ability to engage in tactics necessary to defeat lawless gangs.

Thus, government.