Based on the provided reference, Draco Malfoy cried in Harry Potter primarily due to the overwhelming pressure and fear associated with a difficult task assigned to him by Lord Voldemort.
The Difficult Task
Draco was tasked by Voldemort with finding a way to allow Death Eaters entry into Hogwarts School of Witchcraft and Wizardry. His chosen method involved repairing a damaged Vanishing Cabinet located within the school. This Cabinet had a counterpart in Borgin and Burkes, a shop in Knockturn Alley. Successfully repairing the Cabinet would create a passage between the two locations, bypassing Hogwarts' protective enchantments.
The Stakes of Failure
The pressure on Draco was immense. Lord Voldemort had made it clear that failure was not an option. The consequences of not completing this mission were dire, threatening not only Draco's own life but also the lives of his parents, Lucius and Narcissa Malfoy. This extreme pressure created a significant emotional burden on the young wizard.
The Core Reason for Crying
The reference explicitly states the heart of his distress: He understood the monumental difficulty of fixing the Vanishing Cabinet and the catastrophic repercussions of not succeeding. As the reference notes: "He understood that fixing the Cabinet was an extremely tough task and if he failed to bring in the other Death Eaters, he was as good as dead and so were his parents. That he might fail and not be able to fix the cabinet was the reason he cried."
Therefore, Draco's tears stemmed from the fear of failing to complete his dangerous and technically challenging mission and the knowledge that this failure would lead to the death of himself and his family.
Contributing factors to his distress included:
- The difficulty of repairing the complex magical object.
- The severity of the consequences (death) for himself and his parents if he failed.
- The isolation of undertaking such a task largely on his own.
- The moral burden of assisting Voldemort and the Death Eaters.