This thread continues to be a great resource for common misconceptions about anarchy. Like this one, for example:
I'm still curious how are you going to make all people
universally agree on these laws? Who actually adopts a law and what would happen to those who will be against the adopted law?

The idea of anarchy means, "no ruler", remember? A ruler might be anyone or anything, which enforces a given set of rules (laws). This means, that when anarchy suggests, getting rid of rulers, it suggests getting rid of
universal laws. - a single set of rules being enforced on everyone in a given territory and opening up the debate to multiple, competing,
voluntary sets of rules.
Look at it this way: in the past, there have been fought religious wars over the idea, that there simply can't be more than one religion (set of rules) in the same place. In the present, wars are fought over the idea, that here simply can't be more than government (set of rules) in the same place.
EDIT: just noticed this:
Adaptability is not human nature, it is a trait of all living beings. Human nature is hierarchical because humans are social beings, i.e. tending to organize into hierarchical societies. And yes,
it is programmed into us before we are born... 
Adaptability = trait of all living beings. Humans = living beings => Human beings have the trait of adaptability. Right? As much as dislike Aristotelian either/or logic, I think his syllogism works within that framework.
The bolded part is what really interests me. I disagree with that statement and instead tend to subscribe to the
8 circuit model of consciousness, which would argue that all we are programmed with before we are born is the
ability to perceive and live in hierarchical social structures (2nd circuit in that model), but the actual approach towards these structures is programmed into us during periods of "imprint vulnerability", meaning the time, when that particular circuit of intelligence first kicks into action as we grow up and evolve as individuals. And it is programmed into us mostly by chance exposure to our environment. You can also create a controlled programming environment by using rites of passage (as many tribes still do). Or you can learn how to re-program yourself, which would be my preferred option.
On one level, this is beyond the scope of this discussion, because we're talking about the feasibility of Anarchy, but on another level it is deeply connected to the discussion and seems to me to be at the root of the ideological debate between, let's say "authoritarians" and "libertarians". Both camps seem to come from different assumptions: the first being that people have a fixed human nature, which is slanted towards selfishness, evil, and similar concepts and can not be changed. The second being that humans either are of a permanently good, benign and cooperative nature, or that their character is fixed only a little or not at all and is thus subject to influence from the environment.
Anyway, let's keep the discussion going, this is providing me with an excellent framework for an article I am planning to write about human nature and anarchy
