In Myths Transformed, HoME X, we learn that Melkor's purpose became utter destruction. To that end, he was impeded by the Noldor (first and foremost), and secondly, by the Girdle. In that sense, he did need to destroy the girdle. I would also have issues with seeing Melkor as intently driving forward the disputes between the elves, or with the dwarves. He sown seeds, and they gave fruits, rather independently, as they did even after his death (as the last paragraph of the Silm. tells us
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Originally Posted by Of the voyage of Earendil and the war of wrath, Silmarillion
Yet the lies that Melkor, the mighty and accursed, Morgoth Bauglir, the Power of Terror and of Hate, sowed in the hearts of Elves and Men are a seed that does not die and cannot be destroyed; and ever and anon it sprouts anew, and will bear dark fruit even unto the latest days.
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In the Silmarillion, we even know that he was surprised to see the noldor coming to knock on his door; I also doubt he planned or foresaw the fight between the dwarves and Thingol, if that is what you referred to.