(making this into a separate comment since it's a different, related idea)
How about having a "flag" link for comments with a drop-down list of points from the guidelines that the comment violates?
It would reduce the noise from other replying to the comment stating why they think it's inappropriate, and would still let the commenter know what they did wrong while burrying the comment.
There is a spanish Digg-like site, Menéame [1], which offers this same option. I think it works pretty well as it keeps the site clean of news which don't obey the rules. Despite that, people will still reply explaining why they flagged the comment (and I think this is the correct way to behave: you should explain why the comment is wrong and how to improve it in order to improve the community)
How about having a "flag" link for comments with a drop-down list of points from the guidelines that the comment violates?
It would reduce the noise from other replying to the comment stating why they think it's inappropriate, and would still let the commenter know what they did wrong while burrying the comment.