People seem to have the strange idea that there would be no way of punishing people for their actions under anarchy, as if everybody just freely murdered and stole from each other for the 99.9% of human history that occurred before governments were invented. Back then, such things were decided on a case-by-case basis. The tribe/clan/villagers would get together and work out a solution for each problem that affected the community. Of course this is impossible on such large scales as the modern nation-state where millions of people would render such a system impossible for obvious reasons, but society could be restructured so power is focused on the community instead where people's votes and individual opinions actually matter.

Anarchy can only be achieved if we can undo some of the huge problems that industrial capitalism has brought about so that a society not based on greed and exponential growth can be created. For example, capitalism with its focus on effeciency and producing more, more, more has produced a huge food supply, and anyone with a basic understanding of biology knows that if a species' food supply increases its population will too, so we find ourselves in the predicament of having way too many people. Capitalism tells us the solution is to produce more food to feed all those people, but clearly this is the wrong path since it will only make the problem worse and worse. But capitalism is the only system capable of controlling such huge populations and producing enough food to keep up with the booming population, so practically nobody wants to get rid of it since advocating starvation isn't a very popular stance.

There are three ways out of this mess, and we're going to take one of them whether we like it or not because the simple fact is that we can't support all these people that capitalism has brought about:
1) We can voluntarily lower our birthrate (yeah, right)
2) We can have a giant nuclear war or mass genocide that kills off billions of people (I used to think this was unlikely, but now Bush is in power)
3) We can wait until capitalism reaches the end of the line, that point where its dream of infinite and eternal growth is realized to be impossible, and it can no longer continue due to strains by the humongous population and the inability to extract and deliver resources efficiently enough to keep them alive and willing to work. Billions will die from starvation. This is inevitable if one of the other two doesn't happen, and if we are lucky the Oil Peak will be a catalyst in this destruction of capitalism sometime this century.

After that, then maybe we can establish anarchy. But just because it wouldn't work with today's twisted society doesn't mean I should support the very system that got us into this mess.