In the psychological thriller film, The Joker (2019), Arthur Fleck is discriminated and disregarded by society. His history of abuse eventually causes him to become a nihilistic criminal with a clown motif and he turns into The Joker, despite being a good person for the most part of his life. Which aspect of psychology best explains the contention that Arthur Fleck was inherently a good person but became The Joker largely because of the failures of the society?