What would you do - create a law that says they have to publish anything they find immediately? How long do they have to do so? What if they aren't ready to publish because they haven't gotten all of the facts together yet and they don't feel like they should publish yet? What if they don't see the importance of a story until something else happens to put it in a more important light? Imagine all of the issues that could come about from a democracy trying to force the press into some kind of time-table and official means of reporting the news to make it "fair"...
I think it is you who are not quite understanding the role of the media in a democracy.
The government should have no control over the media, aside from adjudicating wrongful reporting (i.e., enforcing laws against things like slander and libel and disseminating deliberate misinformation), but that applies to everyone who makes statements in public, not just a group or person who is considered "media". In fact, the media are not an arm of the government, and shouldn't be considered a tool of democracy insofar as it is something written into a government's constitution that a specific group of people will be called "the media" and have a certain responsibility to do anything.
It is THE PEOPLE's responsibility to disseminate information and call the government on crap. THAT's what the media is, a group of people who have dedicated themselves to informing others. There are many kinds of media - there is entertainment, news, sports, education, etc. None of that should be controlled by the government as to what is the content (in my opinion) and certainly shouldn't be telling any of the media outlets when they should be displaying whatever theme they may be involved in. If enough people don't like it, that particular media outlet will have no followers and won't continue.
If you think that the existing media outlets aren't doing a good job, start one yourself and do it the way you think is right! If you can't get enough people to follow your particular output, then it is society itself that is rejecting your way and you cen't ask the government to force people to listen to you.
In a democracy, there should be freedom of the press to the point that there is enough competition between media outlets that they fall over each other to get the news out first. That doesn't happen here for obvious reasons which have been discussed ad infinitum.
However, just the fact that you mention in another post to search for "congress immunity" and expect people to get results that are not covered in mainstream media here, shows that actually the media is not just made up of a few big players here, but that the information is available. Not to mention the fact that very few people here are caught by surprise when they hear of the corruption, even to the extent that everyone knows Cristina has a bunch of money hidden, that she's taken from the people of this country.
It seems to me that many people here (Argentina, not the forum) actually look to the government to control every aspect of life, including one side that wants the media under control (of the government), and another that wants controls on the media to "make things fair" (not sure what the end result's difference would be...). To me, it's a sign of what's wrong with governments (and the people who allow them to continue) who want to make "everything fair for everyone". No one takes responsibility for making sure things are right and fair outside of the government (society), they are too worried about figuring out how to get the government to force other people to do what they want in the name of "fairness".