I try not to read to much into Tolkien, symbolically. Especially since I read that bit in the prologue about "applicability". Beyond that, it seems that Morgoth being bound to the earth helped reinforce that he was no longer of Aman or the Valar, which separated themselves from the earth. All "worldly" evil seems to have come from him. (Ungoliant being an example "external" evil, not a direct result of Melko's meddling). As always, correct me if I'm wrong.
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