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Why does Mario Cavaradossi agree to help Cesare Angelotti?

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Mario Cavaradossi agrees to help Cesare Angelotti primarily because they are old friends and fellow revolutionary sympathizers. Upon discovering that Angelotti has escaped from imprisonment, Cavaradossi immediately vows to assist him.1

As the plot unfolds, Cavaradossi further commits to aiding Angelotti by offering to hide him at his own country villa to protect him from the pursuit of the police chief, Baron Scarpia.1