Actually, it has been proven there is a large percentage of people living in the west of the world, specially in the United States, who does not longer believe what they see in the news or believe news are extremely biased to one of the political spectrum, so they are likely not to inform the population but rather try to indoctrinate all those who are viewers. It has happened specially to CNN, which slowly but steadily turned into a News medium to a propaganda and indoctrination tool in favor of the democrat party of the United States, the same happens with Fox and Newsmax.
We live in times and in societies in which is more likely to find the truth in post people share in social media, instead on Television, because now anyone can be a reporter since we all now have a camera always with us and internet connection.

So saying we all believe what the news say is an over-estatement.