I think there are fake stories that reinforce your current predisposition and then there are fake stories that a vulnerable human being reads and it takes their beliefs to the fringe.

Also, I have a hard time believing that seeing one or two stray bogus stories is the same as seeing bogus stories everywhere you care to look.

In one case a vulnerable human being might have enough reason to doubt what they're reading, and in the other case they suddenly feel like the world is caving in on them.