The article mentions how fiction has convinced people that cars explode, leading bystanders to drag people out of car accidents, injuring them. Another example

The article mentions how fiction has convinced people that cars explode, leading bystanders to drag people out of car accidents, injuring them. Another example could be crime or terrorism shows that make people think LE should have extraordinary powers. Fiction, even unrealistic, certainly effects people. As the article mentions, brains believe everything they hear, at first. The understanding that something is a lie comes after. Additionally, we cache thoughts, for efficiency and do not always reevaluate thoughts for truthiness. So being bombarded by many counterfactuals can certainly change our minds in the "real world". This is only mentioned because it points out that reading fiction can be actively harmful, so we can't just sum it up as just potentially positive.