Actually, this article is great because it proves that most media distorts facts without venturing into controversial territory (the science paper clearly did not say what the articles said it did). This is as good an example as any on the phenomenon you mentioned, and it's a good topic we all remember and may have been convinced by. My parents and I have already had a discussion about it, where they were convinced that marijuana was much worse than believed, and I remained open to the idea that there may be merit to the study they heard about. But this is an article many people were convinced by because it fed into existing bias well, which is exactly the kind of thing we need to expose.

We all know for example that FOX News distorts facts, but if you go into a conversation calling them out, you will lose many people who will claim you are biased. By first pointing out specific, provable stories that have been misreported by all media, you can get a person to believe that news is being poorly reported. Then, after you have convinced them of that, and that it is a problem, you can say "hmmm... now I wonder who is most guilty of perpetuating this." You'll find FOX news in there of course, but if you actually look you will find that all corporate-owned media has turned into fact-indifferent "news entertainment".

Also, it isn't irony to cover something specific instead of the broader issue. It might be ironic for Fox to cover the epidemic of misreporting in the media, but even that would actually be somewhat expected behavior given that they keep insisting they are the only fair network.