Arnold Zwicky on Language Log:

I resent the idea that Language Log should not only be expected to provide blogging space to everyone who wants to write — if you enable comments, then the space belongs to the commenters, not to you, as any number of people have explained to me now, contemptuously — but should also allow commenters to conceal their identity, even from the bloggers.

I fully agree with Arnold here: the comments on my blog are part of my blog, of which I am the editor, and I decide which comments I accept and which ones I delete.

I am lucky, I guess, in that I have never had to deal with offensive comments, but if I ever get any, they won't make it onto my blog!