As someone who attaches his name to his writing, I hold a certain amount of scorn for people who post under pseudonyms or anonymously to news sites.
I understand that there are occasions when some commenters have something valuable to add to a discussion and if they use real names they could face censure, discipline at work or social repercussions. But I presume that these situations are few.
Rather, anonymity gives many commenters the freedom to be sarcastic, glib, hateful, and oftentimes, downright stupid. I highly doubt that those who scribble some of the more lecherous comments I've read would have the stones to say those same things to the person or organization who is the target of said foul comments.