What is the main idea of Lu Xun's Madman's Diary? What is the writing clue of this article? What is the image of a madman?

The main idea of Lu Xun's Madman's Diary was to resist feudalism and imperialism, to reveal the dark side of human nature, and to call for people to awaken and self-liberation. The writing clue of the novel is the protagonist's inner monologue and the description of the external scene. Through his deep reflection and reflection on the era and society he lives in, he shows the distortion of human nature and the absurdity of society. The image of a madman is Lu Xun's deep insight and criticism of human nature. Through the image of a madman, he shows the madness and distortion of human beings, reminding people to examine their own inner hearts and find the way to self-liberation.