In Chinese culture, heavily influenced by Confucian values, there is a strong emphasis on self-cultivation (修身, xiūshēn), discipline, and continuous improvement. A person is expected to strive to be a better student, child, parent, and member of society.
`堕落` is the direct antithesis of this ideal. It represents a betrayal of one's potential and, by extension, a failure to one's family, community, and ancestors. The “fall” is not just personal; it brings shame (丢脸, diūliǎn) upon the entire family unit.
Comparison to Western Concepts: In the West, the term “fallen” often has religious connotations, like a “fallen angel,” referring to a fall from divine grace. While `堕落` can be used in this context (堕落天使, duòluò tiānshǐ), its core cultural meaning is more secular and social. It's less about sin against a god and more about the violation of social and familial duties and the failure to live up to one's responsibilities and potential. It's a fall from a state of expected virtue and social contribution.