It is more pessimistic than Realism, primarily.It is more pessimistic than Realism, primarily. The Naturalist writers believed that larger forces were at work: Nature, Fate, and Heredity.The Naturalist writers believed that larger forces were at work: Nature, Fate, and Heredity. Their writing was inspired by hardships, whether it was war, the frontier, or urbanization.Their writing was inspired by hardships, whether it was war, the frontier, or urbanization