Masked crusaders

Not many people use their real names to post comments on Cif. To encourage a level of self-censorship, should the site reject this anonymity?
The article concludes “This is far from trivial – it’s hard to imagine a country surviving when its citizens know that they can only speak freely when masked. Rather than decry the anonymous nature of their critics – yes Polly Toynbee, I’m thinking of you – Guardian columnists really should consider why these individuals feel they need a mask. True, anonymity and abuse are not features of liberalism, but then neither are witch-hunts.”
http://commentisfree.guardian.co.uk/frank_fisher/2007/06/masked_crusaders.html