Of all of the many disliked characters in Peter Jackson’s movie adaptations of The Hobbit, Thorin is probably the one who gets the most unjust hatred. It is true that Thorin can be too proud and stubborn, and often appears to be putting his lust for gold above the people he has promised to help, including the company of loyal companions who have stayed by his side. However, despite his flaws, the dwarf is often saddled with an unfair perception.
Many members of the audience, when watching The Hobbit movies, believe that Thorin is selfish in leading the other dwarves back to Erebor. It's easy to believe, upon watching the films, that that the fight to reclaim their homeland is only a guise or a compelling excuse to give Thorin access to the hoards of gold. But actually, despite his ignorant and arrogant claim to the throne as his birth right, it isn’t he who started the quest in the first place.
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This is only touched upon briefly in the extended edition scenes, and expanded upon much more effectively in the book, but it was really Gandalf the Grey who set the wheels in motion for the quest for Erebor. The movie depicts the scene of Gandalf approaching Thorin in the tavern at Bree, and convincing him that now is the time to go back to the Lonely Mountain:
“I urged your father to march upon Erebor, to rally the seven armies of the dwarves. To destroy the dragon and take back the Lonely Mountain. And I would say the same to you. Take back your homeland.”
Thorin at first thinks this is folly and resists the wizard's urging, but is eventually swayed by pride and by desire for revenge of his fallen kin, who lost their lives when Smaug the dragon first invaded their kingdom.
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