It's actually really simple. An ability to see the world accurately was never a necessary condition for survival, so long as the model in your head was good enough to assure you could eat and reproduce.
People walk around with false stories/narratives (and increasingly intricate ones at that!) in their head not because it served some evolutionary purpose, but instead because it just wasn't consequential enough to prevent survival.
People walk around with false stories/narratives (and increasingly intricate ones at that!) in their head not because it served some evolutionary purpose, but instead because it just wasn't consequential enough to prevent survival.