On my blog I don’t allow anonymous comments. My blog is not a secret site and everything is up for anyone to read. If people want to comment they can do so with their identity revealed. Anyone who has something to say needs to say it as they are and not hide behind anonymity.
I also promote healthy, considerate, polite conversations too. There is no need to get personal in regards to your blog. Everyone has an opinion but everyone should be mature enough to have respect for their fellow blogger too. Keep things positive and clean.
This is just my opinion.
The Tumblr Years of Tony Burgess 