we simply study free market economics, game theory, prisoner dilemmas and so on.
peaople may be violent, BUT violence is not the only interest, they care a lot for they money, for example, if the use of force is socialized you didn't pay so much for arrest marijuana users, because the money for that is taken by taxes. But if you have to directly pay for arresting marijuana consumers, you are going to think twice before doing that.
another thing that people usually care a lot more of being violent and steal is avoiding to get stealed and killed and injured, they are willing to pay some money to remain reasonably safe from violence. that's it people is more willing to defend themself than to hurt others without a return, that's why in an anrchocapitalist society laws tends to be in conformity with the golden rule. It may be not perfect (nothing in this world is) but look at what we have today believing a self-restrained government is more utopistic than anarchy.
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