I think you might be bashing Eonwë dahling a bit too hard. After all, even though he's a Maia, he isn't omnipresent. There was no way he could have scoured all of Beleriand and all of Middle-earth looking for all of Morgoth's creatures and minions. It was just physically impossible. I think he felt that if he captured Morgoth, then the worst of the hostilities would end, and in a sense, that was almost true. Sauron very nearly repented, and it was only his jealousy of the Elves that made him become corrupted again.
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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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