Taxi Driver (1976) De Niro film

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Have you watched this film? Critics always says, It is one of the greatest films in the last decade. This film is about loneliness, about the isolation of a man in a society full of scum. His objective is to finish with the scum of the streets.But somewhere I lost in understanding his character. (His failed or tried attempts to assassinate a candidate who is running for president.) What are directors thoughts on thesescenes.