I don't care that you haven't heard of it-- what you have or haven't heard of means nothing
tl;dr: Why is no one talking about what a waste of time it is to complain about why people aren't talking about particular things?
I made this resolution in June:
And it has really has cut down on the echo in the chamber of my mind!
I was inspired to renounce generalizations about public opinion based on my facebook feed by, of course, something I saw on my facebook feed. I wish I had screencapped this comment, but it's too late now. Basically, the top comment on an article Bill Maher posted about the Democratic Primary-- it was one of those 1000+ comment threads-- said "Supposedly Hillary is winning, but I suspect a conspiracy, because I don't know A SINGLE PERSON who voted for her." Except I'm sure I'm remembering it too kindly.
The sad truth is that it's very difficult to make generalizations about what "people" are saying in the age of social media, because you are seeing personalized content. And with the profusion of online media outlets, I don't see how anyone feels comfortable saying that "the media isn't sufficiently covering X." Most of these complaints are made by news stories themselves. (Apparently, claiming that a story is under-reported is very successful clickbait.) Clearly someone knows about the story if they know to complain about how underplayed it is.
In fact, whether or not you have personally heard of something has never been a great means of assessing how thoroughly discussed some piece of news is. I only care about your impressions if you have some reason to think your ignorance of coverage is evidence of absence of coverage. If you are a well-connected expert in your field and you haven't heard about something through your normal sources, that's informative about how well-reported it is, because you would have expected to hear about it. If you are just casually browsing the news, and you see a news story that informs you about an issue, I don't really care if you think you should have seen more than one of those stories. I especially don't care if you read a story about how "the media isn't sufficiently covering X-- where's the outrage?!" and find yourself outraged that a story hasn't been covered more.
In order to draw valid inferences about public opinion, you need well-done polls. Unfortunately, polls are not perfect and you can't do a sound poll for every question. Given that reality, I advocate 1) taking your impressions of what people are saying with a handful of salt and, 2) being the change you would like to see in public discourse. If you think a story or topic should be discussed more, discuss it instead of complaining that no one's discussing it.