[Mithadan]

In another thread dealing with this subject, I suggested that one reason the Valar called upon Eru is that their role in Arda, in part, included acting as the guardians and protectors of the Children of Iluvatar (Elves and Men). The Valar were not "allowed" to kill the Children, thus the Numenoreans could have done significant damage in Valinor both to the land and its inhabitants. The Valar had no choice but to call upon Eru under the circumstances.