You can say it is true that you believe that blue is the best color. That is where truth and opinion intersect. A very tiny, basically insignificant, quanta of data. But when you can manipulate the opinions of millions of people, it can have a very real impact on the world.
The thing you need to really understand about opinions and beliefs is that they tell you more about the person than about reality in general. So when people report their opinions about what happened, or give you an interpretation of facts, rather than simply the facts, they are, indeed, trying to force their views onto people.
People have this mental mechanism of trusting authority because it frees up brain processing power. The more information there is, the more you need to know in order to make decisions more suitable for survival. Trusting that "authority" wouldn't let anything bad happen frees all that up so we can pursue the things that release the dopamine we desperately crave, like playing bubble blaster on our phones.