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.
Ok, there's no ruler, no universal laws anymore, and so why do you think there will be a new shiny set of rules everyone on the block agrees upon? People are different and even between two people you will get a disagreeing minority...
