Ok, sure, but do you have the ability to grow your own food, weave your own clothes, and build your own house?
Yes, yes, and yes. Whether I do this efficiently requires skill, which can be gained through an apprenticeship or through trial and error.
People may start out as homesteaders on the open prairie, but after a couple of generations of "specialization" the ability to fulfill our basic needs evaporates.
Nothing which can't be learned again; like riding a bicycle.
Great, so where does "law and order" come from?
From the very mechanism I just described. It's simple game theory: each participant engages interaction with a set a preconditioned stipulations to which each party agrees. Each player participates to the extent he or she is willing. Each player is allowed to exit with no less than they came in. This forum is a great example: I agree to terms before joining this forum. There are rules and regulations imposed by the sites owner, and overseen by his/her moderators. If at any point I don't agree with terms, I can simply exit the arrangement. Since the owner of the site as per the descriptions "owns" the site, I don't have any claims, so my exiting the arrangement would amount to no longer participating on the site.
Can we rely on mob rule?
How is that different from democracy?
How do we defend against vigilantes?
Private security.
People may start out as homesteaders on the open prairie, but after a couple of generations of "specialization" the ability to fulfill our basic needs evaporates.
Nothing which can't be learned again; like riding a bicycle.