Why did Sinclair assume the events of the book would portray the need for socialism in early 20th century?

In Sinclair’s view, socialism is the cure for all of the problems that capitalism creates. When Jurgis discovers socialist politics in Chapter 28, it becomes clear that the novel’s attack on capitalism is meant to persuade the reader of the desirability of the socialist alternative. When socialism is introduced, it is shown to be as good as capitalism is evil; whereas capitalism destroys the many for the benefit of the few, socialism works for the benefit of everyone. It is even speculated that a socialist state could fulfill Christian morality. Again, there is no nuance in the book’s polemic: The Jungle’s goal is to persuade the reader to adopt socialism. Every aspect of the novel’s plot, characterization, and conflict is designed to discredit the capitalist political system and illustrate the ability of a socialist political system to restore humanity to the downtrodden, exploited, and abused working class.