Some do, and others don't.
You cannot awaken someone who is not asleep - a great many knew full well that it was false, but repeated the narrative because it served their purposes. Repeating that narrative means that most normal folks feel the need to dispute the facts. But the person knows it is a lie, so the facts were not relevant, making it largely invulnerable armor.
You cannot reason a person out of a position they didn't reason themselves into - the people who did believe that, despite evidence, are holding that position because it resonates with their fears or preferred worldview. You cannot address their position without approaching the emotional underpinnings. And you generally cannot do that with a stranger.