I have updated my comment policy to try and be clearer about how and why I do things (like when I feel a comment should be removed). It can still be found on the site policies page.
In a nut shell I've clarified that being spamming is a no go and that I like to think disagreeing with me is fine. I've also covered SEO (and it's abuse) as well as the legal question of comment authorship and therefore ownership. I also mention freedom of speech issues.
As always - feel free to say something related tot he topic of the post.