When interpreted literally, the 1976 film ends with a lonely taxi driver, Travis Bickle, saving an adolescent sex worker by killing her pimps, and then becoming a New York City hero who seemingly fulfilled his destiny.
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We never learn exactly what happened to Travis during Vietnam, and the rest of his past remains unexplored, so there's no way to explain why Travis has become the way he is. His war experiences must have influenced his character, acquainting him with violence and helping to turn him into a killer.
When Travis pulls away, he feels content. He is driving in the city, a place that maybe has become less frightening to him. As he continues driving, he glances in the rearview mirror and sees a portion of himself. His forehead, eyebrows, and eyes come into view and the scoring goes ominous.
Based on a real-life story, the film centers on a taxi driver from Seoul who unintentionally becomes involved in the events of the Gwangju Uprising in 1980.
Those with schizotypal personality disorder tend to feel uncomfortable and have a difficult time in social circumstances, although they may still be friendly towards others. In the film Taxi Driver, Robert De Niro's character Travis Bickle seems to be suffering from this disorder.