People, no matter the inteligence or schooling, are more likely to believe what they hear more often. (If 10 people you know swear that eating mint will keep you from going bald it might just be true)
This makes sense and is normal, at least until the modern world.
Now add social media and an algorithm that its only purpose is to increase clicks/likes/interactions. Suddenly everything everyone is talking about is whatever you clicked on last time. A positive feedback loop occurs. The more videos you look at on the same topic, the more those get served, the more you view them, the more you believe them.
Experiment : Try creating a brand new Google account and watching 3 videos on YouTube on a single topic. Refresh YouTube page, or check back tomorrow.
Just like eating only junk food is bad for your body, so is current news bad for the mind. I suggest you seek out actually positive news channels on YouTube or smth. We live in a very shitty world but there is still so much good in it. There is free open source software out there, there is volunteer work, there are people who give time, money, energy to worthy causes, with nothing to gain. And that’s worth fighting for (Mr Frodo)!