There is some great information posted in this thread. I always just thought that Hurin may have inadvertently tipped Morgoth off to the location of Gondolin, but Morgoth would not have been able to find a way through the mountains without Maeglin.
I wouldn't hold too much against Hurin though, since he was not really thinking clearly after years of torture. If blame is cast on Hurin, then he could similarly be partially blamed for the fall of Thingol and Melian's kingdom because he gave Thingol the Nauglamir, which led to the fight with the Dwarves and the fall of the two rulers. Doriath was at risk from that moment forward.
The fall of Doriath was just a series of bad circumstances. The fall of Gondolin...that's another matter.
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