I think the Valar felt that they didn't have the authority to violently repel Ar-Pharazon's invasion, as that very probably would have included killing quite a number of Ilúvatar's Children - which none of them (excepting Morgoth) has ever dared.
So Manwe's call to Ilúvatar was probably rather something like: "Look what these brats of yours are doing! Don't you think you should deal with this problem yourself?"
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Und aus dem Erebos kamen viele seelen herauf der abgeschiedenen toten.- Homer, Odyssey, Canto XI
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