In the climax of the movie, FBI agent Kate Macer (Emily Blunt) becomes entangled in a complex web of corruption and violence surrounding the drug trade along the U.S.-Mexico border. She discovers that her superiors, including Matt Graver (Josh Brolin) and Alejandro Gillick (Benicio del Toro), have been involved in questionable operations.
In the resolution, Kate, disillusioned by the moral ambiguity and brutality she witnessed, confronts Alejandro about his true identity and the motives behind their operations. It is revealed that Alejandro, whose family was killed by a drug lord, has been seeking revenge against those responsible.
The film ends with Alejandro executing the drug lord responsible for his family’s death and issuing a chilling warning to Kate about the harsh realities of the ongoing drug war. Kate returns to her job, but the experience has left her deeply affected by the dark and morally ambiguous world she encountered.
In summary, “Sicario” concludes with Kate Macer grappling with the harsh realities of the drug trade and the blurred lines between justice and vengeance. The film explores themes of morality, the cost of the war on drugs, and the complexities of law enforcement operations in the context of the U.S.-Mexico border.