Morgoth and Doriath

[Morwen]

But surely, if Doriath was indeed his primary target, his intent wasn't merely to annoy or insult Thingol and Melian, who he "hated and feared". I would argue that his intent was to create an opportunity for the later destruction of Doriath...

I don't know that it can be said that Doriath is his primary target. After all, Hurin was captured alived in the hope that he would provide Morgoth with info on the whereabouts of Gondolin and Hurin shortly after his release unwittingly provides Morgoth with a general idea of its location. I don't see how his entry into Doriath and even his initial insults to its rulers can be part of some "Morgothian" plan for its destruction. Unless Morgoth was somehow using Hurin as vehicle to get Nauglamir to Doriath, knowing that its coming would start a chain of events leading to that Kingdom's destruction. But I don't recall this ever being mentioned.