Personally I see no sense in trying to contain discussion on-site rather than here, on Facebook, or reddit etc. People want to discuss things in the community of their choosing. Better to intelligently collate and sort those conversations. I wrote about it here if you're curious:
I actually believe exactly the opposite, it was chance that you saw this post on HN and had the good faith to update the article, and I believe fostering a nice community on your own sites increases the odds of these kinds of events, and in the end improves reporting accuracy and quality (among plenty of other benefits).
http://techcrunch.com/2013/10/13/shouts-and-murmurations/