Related to Rowlings' goblins I think is her handling of the theme of race generally, of what she does with this idea of Muggle, Half-Muggle, Pure Wizard, and what happens to those who perpetuate such distinctions. She doesn't uphold the special distinction which Tolkien does for the half-elven.
Can't say more for fear of spoilers.
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I’ll sing his roots off. I’ll sing a wind up and blow leaf and branch away.
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