I do think the article has a brilliant point about the condescending tone all of these arguments have in common, and that it is probably correct about a lot of situations (such as the fact vigilantism isn't a common thing despite being idolized in media) but at the same time I'm not sure that it's free of exceptions either. As an example, think of how many people believe Romeo and Juliet is an actual story about devoted love, as opposed to its true nature of 'here are some stupid teenagers doing stupid and tragic teenager things'. I hate to pick a target that paints me in a light open to accusations of confirmation bias, but Twilight I'd say is another exception in my opinion, as the number of times I've seen the relationships in that book legitimately called romantic by people lacking life experience disturbs me deeply.
To re-frame the conversation, I'd state it as media can't change beliefs, but it can reinforce them. I firmly believe no amount of violence in media can turn someone who has accepted that violence isn't a solution in real life into a killer. On the other hand, I'd say if a person already believes something, then seeing it in media (especially when its repeated countless times across different productions) can reinforce that belief. To pick a slightly less charged example, think about how first aid is presented in media: I'm willing to bet there are a lot of people out there who, because they've never been taught otherwise and don't have a reason to question what they see repeated in media, would do catastrophically horrible things unknowingly in such a situation. I'm willing to bet for nearly every example you could find on TVTropes' page "Worst Aid" there is a dishearteningly large percentage of people who believe it.
Edit: to clarify on my post, I'm not suggesting things like 50 Shades should be banned, since I acknowledge that there is probably an audience that can enjoy it responsibly. If someone finds it entertaining while understanding its purely fiction and portrays an abusive relationship, I'm not going to look down on that person just for liking it. My problem lies in the fact that while most people know 'vigilantism is bad', far less people know things like '50 Shades is abuse, not bdsm' and 'An epilepsy victim won't choke on their own tongue'. Even atop the obvious arguments against censorship, banning just sort of 'enshrines' something, in addition to making the people who enjoy it defensive rather than receptive. As for a solution, I guess the only one I can think of is to encourage more media with opposing portrayals.