People have limited attention and time. It's perfectly valid to point out how the media is withholding information and distracting from more serious things on purpose. Otherwise it is just bike shedding.
This is mostly confirmation bias since no one individual has the bandwidth or resources to look at every single story produced on every single topic on a single day. I tend to see people complain "this tragedy happened today and I don't see it being reported by the news!", implying that the media has something to hide or they value certain groups of people over others, but this is not a claim worth its salt.
There are many reason, both from the organization's standpoint and from the individual's standpoint, why this claim isn't true. It's a weak argument that only serves the purpose of distracting from topics at hand.
It doesn't change anything though. Media is still not going to focus on important problems. It exists to influence people, not to report on all the right things. And it's worth pointing this out.