That is entirely the point. The media only pick up a story if there is viewer interest. For there to be viewer interest the characters on display have to behave in a way that will hold audience attention. That might be lots of wailing, it might be becoming activist, or it might be behaving in a way considered unbecoming. Ideally the parents should be able to hold a conversation so they make for decent interviews, if they are semi literate they have little hope of more than passing coverage.
If someone is missing it also helps if it is the right demographic. Something like 60% of people who go missing are black males, but do you ever see any of those stories on the media? Any at all? No. The missing persons cases that get coverage are usually white females, in particular if they are young and/or blonde. Helps if the parents are wealthy or elite as well, because seeing the rich suffer sells well.
HD's case gets attention because BD is a strong reasonably attractive woman who is married but has a live in boy toy. That is fairly unusual to the point of being mildly scandalous, so it makes for good fodder to hold audience interest, especially among the middle aged female segment who are particularly interested in cases like this. Plus, HD falls into the young blonde female category, which is ideal for the media. For a case where police know absolutely nothing, it sure gets a lot of attention.Now, who else gets involved in cases like this? You will see the regulars who routinely pop up apparently inserting themselves into the situation. It is allways the same people. And sometimes wannabes looking for their 15 minutes. Not a whole lot of them are particularly objective and they essentially say the same thing every time.
When you see the same story repeating over and over and over, you get cynical. As far as the media is concerned, it is pretty clear that this is all just a form of entertainment and they play it to the full to pull in viewership and the advertising revenue that follows. That is why we have shows like NG, and in fact that entire TV channel for that matter.
I have yet to see ANY of these people actually do anything constructive in these cases other than talk about it.