The comment policy on this blog is, in the words of Potter Stewart talking about pornography, "I know it when I see it."
If a comment makes any sort of argument, from whatever perspective, that's fine.
If it contains anything that I think might be illegal under German law (Holocaust denial, legally actionable libel and insults, endorsement of violent crimes), then I'll remove it. Not necessarily because I endorse that approach, but because I live in Germany and try to follow the local rules. Plus, I don't want to get sued. So far, almost nothing like that has ever showed up here, so I'm not that concerned.
I will also remove a comment if it fills me with despair for the future of the human race. You know, something like this. That hasn't ever happened so far.
Needless to say, the views expressed in comments are solely those of the commenters. The fact that I have not removed a comment does not imply endorsement.
That's about it.