Heart of Darkness question

For people who read fiction, the overwhelming body of work shows good wins over evil. There are shades of grey in what is good and what is evil. We also have the anti-hero archetype once in a while, but the climaxes are satisfying or leave a glimmer of hope or the story continuing.

With the exception of the horror genre, the bulk of fiction writing has a positive slant. George RR Martin is among the few authors who writes in a manner where fates play dice like in the real world. Biographies are obviously partisan, but even the autobiographies of reviled personalities present their side of view, seeking the sympathy of the reader.

I was wondering if this affects the world view of the people who read a lot of fiction? The real word is random and unpredictable. The world that operates outside books is a world where people seeking power accumulate more power.

Because of this exposure to a fictional word, are people who read fiction thus more idealistic? Do they come across as impractical to those who don't? I would welcome your thoughts to help me think more clearly about this matter.