I understand where you're coming from (after all, Morgoth did kill me!!!!!!) but we've also got to take into consideration that Manwë just did not comprehend evil. That ability was not part of his nature, and thus, I think Eonwë thought pretty much the same way that his master did. Besides, we all know how glib-tongued Sauron is. He could have genuinely repented, and persuaded Eonwë to let him stay in Middle-earth, and just hid out somewhere. Afterwards, the "second corruption" could have happened.
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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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