When you vote for say, a law making marijuana illegal, you ARE using force against others. You are giving the authority to an agent to act on your behalf to use force against others. The fact that you won't do it yourself just makes you a coward. Same thing as when you vote for warmongering politicians.
You misunderstand me. I'm not having an issue with the fact that force is required. Society has no way other than force to really deal with its worst elements. I take issue with having EVERYONE be the user of that force. It places everyone at risk, and furthermore I'd consider a society where I needed to grow food, weave clothes, and everything else to be a failure of a society as well. Leave the fighting to those whose profession is fighting, same as how we do everything else.
Individuals are often illogical. That's the beauty of the market though. The market on the whole, is. A shopkeeper who refused to sell to those under 30 would likely face some stiff competition from one who would be willing to serve anyone. IF there was in fact a significant market for "stores where no young people are allowed in" and he could stay in business, then hey, more power to him. If the 20-somethings don't like it, let them start their own store.
Well, things like it are why youth leave this place in droves the second they're capable of it, and that's without them being actually barred from anywhere. At any rate, any system composed entirely of illogical beings cannot be said to be completely logical. Regardless, I see a scenario in which towns become largely inaccessible to certain groups to be a very poor one indeed. All that really needs to happen for something like that to spiral out of control is an ideology gaining power over a wide area and spreading (I'll admit, I'm mostly referring to religion here) for things to get very, very bad for a minority if there isn't an overwhelming force keeping such ideas from truly taking hold.
What historical examples? How can there be "historical examples" of the problems of a system that has never been tried?
Your system has been more or less used since the dawn of man up until government was established. Clan systems, tribes, those are mostly all voluntarist societies. They work to some degree on those small scales, but they seem to inevitably lead to them going to war against the other clans/tribes. There really isn't any record of a time in history where there weren't any groups warring with or wanting to war with another group.
As far as the "power vacuum" theory goes, I just don't buy it. There is less centralized power in South Korea than there is in North Korea, is there not?
Less centralized government doesn't make for a power vacuum, and the fact that South Korea hasn't been completely wiped off the map proves that a combination of outside military force and their own military force is capable of providing a great deal of power.
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MMBN style fighting game made by me in the link below!
http://sandbox.yoyogames.com/games/184947-b8bn