The Hobbit: Why Was Thranduil So Disapproving Of Tauriel?

gamerant.com:

One of the most complicated themes in The Hobbit movies is the love triangle that exists between Tauriel, Legolas and Filli. This is definitely a plot device used by director Peter Jackson, to elongate the films into a trilogy, and to add more depth and drama into the characters, and is in no way a part of Tolkien’s original books. Tauriel doesn’t exist in the text, she was invented solely for the onscreen adaptations, and Legolas doesn’t feature in The Hobbit book, and wasn’t written until much later, when Tolkien published the Lord of the Rings books.

However, despite these characters being non-canonical within the original story, fans worldwide were sucked in by the romance and the drama, and were keen to see the outcome of which strapping man the she-elf would choose. Although in many ways, the love story detracts from Tauriels otherwise strong and immeasurable character, it did in some ways make her far more steely and determined when it came to the disapproval of Thranduil, Legolas’ father. Despite his obvious scorn of her as a suitable partner for his son, Tauriel’s resilience and tenacity shone through.

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It does seem strange though, that the king would not want his son to be betrothed to such a beautiful, skillful, and commanding warrior, a jewel among their people. Thranduil shows absolute disdain for this idea, warning her ‘do not give him hope where there is none.’ Not that Tauriel ever intended to, it seems clear that she doesn’t see Legolas this way, and that she has the greatest admiration and respect for him as a friend and the prince, rather than as a romantic interest. But why does the king of Mirkwood seem so against Tauriel, and