Cross-posting this from the TftE forum.
It still seems to me that admitting Hurin to Doriath was not an evil deed but only a foolish one. Moreover, if we are considering Morgoth's curse, it had already been admitted to Doriath years earlier when Turin was accepted as a fosterling.
If I'm analyzing the story in a writerly mode, the danger I see with the "evil deeds" explanation is that it may feel too ad hoc - that it feels as if the Girdle fails for no reason other than that this is the moment in the story when the author needs Doriath to be invaded by a hostile force. For me, the notion of the cursed treasure itself being the thing that gnaws away at the strength of the Girdle from within offers a satisfying narrative solution.
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