I think that there are a number of things that could be done to help this Anarchy experiment.
One is to make people's accounts "valuable" to a certain extent.
Bannings mean nothing if someone can just create a new account on a whim. So at least some effort should be made to ensure that 1 person = 1 account. Of course it's pretty much impossible to ensure this, but you could make sure that only one account comes from any given i.p. address. Sure, there are ways around that, but it will at least be a mild annoyance and deter those "casual" users.
Also, a ban should not be a permenant one.
Perhaps it should be the case that a ban lasts one full day. But if multiple people ban you, the bans are served sequentially not concurrently. So if ten people ban you at the same time, you are banned for ten days. Also, any particular person can only place a 'ban' on any other person once every....day? two days? week?
Another is to make everyone's actions fully visible. So if someone bans someone else, everyone can see that. Also, if a post gets edited, it can be seen that it has been edited, and the edits can be viewed through a posts "history". So the original post can be viewed in a "pre-modded" form. Think of how wikipedia does it. Deleted threads/posts should end up going to a "recycle bin" rather than being literally being removed (except of course for anything ilegal).
Making all actions visible and making accounts non-trivial to set up, may encourage people to take responsibility for their actions on the site and give people an incentive to make it work.
Just a few thoughts.
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