A couple of years ago, I had a spam bot post comments to my site and it had some email forwards as the body of the comment. While email forwards are something that people do not look upon highly, the spam bot did post some select email forwards that were among the best reads so I did share them with my readers after 'doctoring' out the links and I didn't feel guilty about it. Sure, there's a limit to which you can edit a comment but simply taking away links does not cross any boundaries.