Open and Censored: the yin yang of a successful culture
The secret for the success of Wikipedia is not to be open (a lot of webpages are open to anybody to write in) but to be a combination of Open + Edited: open but controlled (censored) and standardized.
This is also the key of sucess of a culture. For example, United States 1850-1950: anyone can come, but this is our lifestyle our standards. Roman Empire fell when not enough persons were enough convinced of the Roman values to impose them to an increasingly open society.
And, as with any yin yang or dialectic, you cannot compensate one with the other, both have to be in place.