I can't really say anything without knowing more about your story. Write it the way it needs to be. Don't try to fool people into thinking it's going to be more upbeat than it really is.
There's a great entry I read on a writer's blog about world building in short stories. The author talked about how you create the illusion of their being a deep, vivid world by creating glimpses of the larger society. I think the metaphor she used was instead of having your point of view character walk through doors and explore the world in depth, like you might in a novel, you provide windows that give the reader intriguing glimpses.
Here it is
Heaven forbid should I tell what happened. People get into a hissy fit because you told them ... then you show them and they throw a fit because they've seen just how horrible everything is.
Damned if I damned if I don't.
Again, hard to say what's going on, since I haven't read it. A couple of possibilities:
1. Your critting buddies aren't the best readers for your story. Not the target audience.
2. If you spend a lot of time describing or showing this news story that your protagonist was just following (not in any way involved in), well, it may feel distant and irrelevant. you mentioned that there's a news story about a crime where the anchors are admiring it. Then later another anchor is taken off the air for condemning it. This is the catalyst that gets your plot moving.
So you have two events, presumably separated by some time, that galvanize your character to do something. Yet short stories usually take place over a matter of hours or days at most. It sounds like a high percentage of your "screen time" is being spent on something that your protagonist is only observing, not participating in. This
could make your protagonist seem passive and boring, like they're only reacting to something that happened to someone else rather than making things happen.
As opposed to, say, your character
being the news anchor who loses their job as a consequence of condemning the crime and that being the straw that broke the camel's back for him or her. Or maybe your protagonist is one of the victims of that crime.