Disinformation isn't about convincing you that something is true; it's about convincing you that nothing is true. If information is considered to be unreliable, you are less likely to act on it decisively.
News organizations each push their own agendas by misrepresenting facts or present rumors or second comments as certainty. Then months later, we finally learn really what happened and realize that a lot of the context of story was missing or completely fabricated.
It also seems to have the effect of encouraging you to latch on to whatever "truth" you fancy, providing tools to dismiss any contradictions.
I don't quite get how that keeps people from applying those critical tools to their own beliefs, but we certainly see that a lot. People show up with a Gish gallop attack, without considering the sources that they're using for it.
Regardless, the effect is that in a world that has deliberately deprived people of certainty, they'll defend their own personal domains literally to the death.
News organizations each push their own agendas by misrepresenting facts or present rumors or second comments as certainty. Then months later, we finally learn really what happened and realize that a lot of the context of story was missing or completely fabricated.
Then we lament at the death of democracy.