What is the purpose of complications in a novel's plot?

Not sure if this is right at all: I think it is to get the reader thinking and to intruige the reader.

Explanation:

the words "slavery," "devils," and "murderer" evoke a sense of disgust.

the book's theme is the moral ambiguity of the iranian revolution, history of middle eastern relations and the process of growing up during war. it sheds light on the stereotypical views of middle eastern culture and religion.

the author explicitly portrays the issues of class disparities and racism continously throught the whole novel.

the relationship between parents and childrens, the abandonment of faith, modernity vs fundamentalism and class conflict are the 4 main panels that this novel englobes.

hope this , if you would like me to be more specific about a specific excerpt let me know : )