Mathematician
Reason, and reason again
This may sound like a trollish comment so please excuse me if it comes off that way. I don't intend it that way.
The descriptions of anarchism that I've seen in this thread seem to imply the need for large-scale organization and coordination. Presumably, people would be required to effect this organization and coordination. Decisions would have to be made, and those decisions cannot always rest on the establishment of a consensus. Thus the buck will have to stop somewhere. In other words, to make anarchism work, it seems to me that you need government.
Federalized projects occur all the time. See the international space agency. I might add a lot of companies work together without any conflict, so merely lifting the state out of the picture doesn't askew anything.
I don't recall consensus democracy being brought up in this thread. It could certainly occur in small cooperatives and home associations, but that's a different matter that associations will decide independently.
The government most frequently appealed to is some sort of direct democracy. The problem with that term is its slipperiness. What exactly does it mean?
Whatever people want it to mean. One association could utilize participatory democracy with the internet, another demarchy, and a third something like Switzerland. Since people can freely leave any association they want, permanent leadership doesn't really exist anywhere.
Switzerland says it's a direct democracy, yet it clearly has a government.
You're confusing the term state with government. According to anarchists, a state is a hierarchy of government that lays claim to a geographical area.
Certain cities in Massachusetts apparently use direct democracy, but it's kinda helpful that they have both state and federal governments keeping the peace so they can do so.
Why? How often does a small town in Massachusetts call in the state guard?
In other words, DD can work, but only in the presence of some sort of government.
The EZLN in Mexico would disagree. DD has worked in Spain, Iran, Mexico, China, Argentina, South Korea - its presence was overwhelmed by the warfare of militarist, capitalist, and fascist states. Supposing 70% of the developed world was fascist, it's not hard to presume their influence would snub out heterodox systems. If anarchism becomes the dominant system, it can do the same to statism.