There are legitimate books questioning entire historical events that everyone “knows” happened because the only reports were third hand years after they happened. Questioning what people tell you, even with pictures and sound, isn’t anything new.
In 1938, the New York Times reported that a CBS drama based on H. G. Wells’s The War of the Worlds was taken as a serious broadcast by thousands of people across the nation. They barricaded themselves in their homes, and some even committed suicide rather than be taken by aliens! They printed a picture of a farmer holding a rifle behind a wall, protecting his home from the invaders.
Well, it never happened. The recording was widely available at any records store, and anyone listening to it would be immediately skeptical (it was announced that this was a special fictional program several times, there were commercial breaks, and the whole fake news broadcast segment was only about half of it, maybe 25 minutes long). And yet people to this day believe it to be true.