OK, I can only speak of what happens in the UK, but similar probably happens in many countries.
Have you noticed how the media grabs a story and sticks with it for days on end?
The latest is RAAC concrete in schools. In the UK this lightweight concrete was used as a cheap material in schools and other public buildings. It was used extensively after WW2. It has been found to have a life of 30 years if poorly maintained and buildings can be vulnerable if water seeps into the concrete. Before this, something else was the focus of the media. Things that were once in our focus just drop out of the news.
I am worried that the media sets the agenda.
Back in the late 1960s we were told that the Vietcong were evil and those defending South Vietnam were heroes defending democracy from evil communists. Now, no-one is perfect, but we were fed a line. With the luxury of history we can now see through to the truth.
What would be good is neutral, unbiased, news. The best I have found is "The Knowledge" which is a free email, daily, newsletter.