I think that he wanted to get rid of the Numenoreans first, then he would take over "the world" himself. He wanted to show that they were just arrogant fools, who would do anything. He wanted to completely discredit them in the eyes of the other inhabitants of Middle-earth.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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