In my experience, there are all kinds of websites that give people anonymity and the results are usually good.
It's the opposite of what most would expect, Wikipedia has had some issues, but more or less is an encyclopedia of some quality. That community doesn't appreciate rudeness, and will edit it out and it's just not a fun place for rude people to hang out.
The iPad app DrawSomething, would never be approved at many companies because of the fear that people would draw lewd drawings, but the reality of the game, is most people are respectful while using it, and children play the game all the time.
When people are anonymous - they are usually still well behaved. So, I would not say, the issue is anonymity - if anything it's a minor characteristic that may play into the overall culture but isn't the main issue.
Every community has its own culture, and the thing is, the cultures of some communities are somewhat rude.
I haven't been to Moobunny in years, so I'm only guessing that's the issue here.
Wikipedia is fine unless the facts displease the 3 founders so it is very flawed. The reasons for the required Greco-Turkish war in Cyprus (to stop the unchecked ethnic cleansing and torture camps of the Greeks) is constantly edited back to the popular lie. Somehow I don't think members of my family tortured themselves. Wikipedia is not a trustworthy repository of information.
