And then, the effect depends on a number of mental shortcuts our brain makes - for example, we can be prepared for the main part of the story (say "Navalny was a nazi already in 1980") to be false, but have our defenses lowered for all the side threads (say "and after school Alexei had this fantastic plombir that was so much better back then").
This is once again a natural cognitive bias, but you can train to avoid the implicit trust - auditors do this all the time.