SaucePan Man, Imladris was indeed besieged during Sauron's invasion of Eriador and at other times, but so was Lothlorien. At least Imladris was forewarned of such an assault, and had more time than Lothlorien to prepare for it. Imladris is also farther off, which would give them added time.
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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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