Be careful what you wish for. What if the news didn't report on corruption? Because you can find a whole lot of places where the news won't do that, and you'll know it only from gossip or involvement. What if the news didn't report on tragic events? Let's say a natural disaster or a horrific crime happens in your community, and the news media is just silent, pretending like nothing happened. I bet a lot of people would think it very strange if news media didn't report on these negative events, or if international news didn't report on the war.
> Someone burns a koran? It is only news if it is reported. If someone does it in their basement alone, it would not matter at all.
Yes, of course. But that's exactly what a protest is. It has nothing to do with the burning of the book itself, and everything to do with doing it in public and letting people know. Even if you live in the most rigid dictatorship, you can criticize the president as much as you want in your own basement. It becomes something completely different when you do it on a public square with a crowd watching or participating. But still there are those who want to make what happened in Tiananmen in 1989 become not news. Then it wouldn't matter at all, as you wrote.
As for Quran burnings, a person in my country - that is not Islamic - was sentenced for spitting at and burning the Quran as a protest against a recent Islamic massacre against people in his group. Imagine the situation: Your people are being killed because of a holy book, but you are not allowed to protest against that book. In that case the news media chose to be silent about the protest and about the sentencing of the man. Just an example.
The bigger problem with news media in my opinion is delivery. I can't stand any TV news, because the way the reporters talk is just sickening. They have adopted this kind of venomous and angry voice that just reeks with contempt against the viewer. I remember many years ago I had been out on travels and spent months far away from TVs. I the airport there was a TV with CNN on broadcast, and I was just shocked at how hateful the voices and demeanor of the presenters were. Like, why would anybody voluntarily watch and listen to this? But if you're used to it you might not notice.
But focus on negativity does also get exaggerated in TV news, such as when they are showing clips of traffic accidents far away, or floods in foreign countries that have floods every year, as well as murders in foreign countries that have no international impact. I think it is like you say to keep people in a negative mindset, because that makes them weak and ready to be influenced, not least by advertising that promises to make them feel good if they just buy this product.