The BFG kidnapped Sophie primarily because she saw him and he feared that she would reveal his existence to the human world, leading to his capture and confinement.
The Unexpected Encounter
Sophie, an orphaned girl suffering from insomnia, was awake during the "witching hour" and peered out her window. It was at this precise moment that she witnessed the Big Friendly Giant (BFG) blowing dreams into children's bedrooms. This accidental sighting broke the BFG's strict rule of remaining unseen by humans.
Fear of Exposure and Capture
The BFG, despite his gentle nature, knew the dangers of being discovered. His greatest fear was that if his presence were known to people, he would be hunted down and taken away. Specifically, he was terrified of being "caught and put in a zoo," a fate that would strip him of his freedom and unique way of life. To prevent Sophie from telling others and thus safeguarding his secret and his liberty, he felt compelled to take her.
In essence, Sophie's kidnapping was not an act of malice but a desperate measure of self-preservation by the BFG, driven by his deep-seated fear of human discovery and the grim consequences that would follow.
