Oh, come on. It was always part of the story that Hurin brought the hoard of Nargothrond, from which the Nauglamir was made- cursed by the dragon, by Mim, and by Hurin himself.
How could Morgoth see that Hurin would bring evil with him within the Girdle? Because that's how Tolkien's moral universe works. The taint of Melkorism is rather like a virus- see Aldarion and Erendis. Morgoth's seeds and lies take root and grow. Hurin would do evil, or precipitate it, because he was by now an evil creature: Morgoth had made him that way. His actions in Brethil make that perfectly clear. Even a non-hyperintelligent being could see that Hurin's approach to Thingol wouldn't be all warm and fuzzy. And if you accept the 1977 text as authoritative, then Melian's 'healing' necessarily implies that Hurin needed to be healed of something.
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