A lot of people assume that the Valar aren't to blame, or that very little blame is attached to them, but that isn't true. The reason they brought the Elves over to Aman in the first place was that they wanted to protect them from Morgoth. They assumed that the Elves were like their children, and needed protection and care.
During the Rebellion of the Noldor, it could be said that the Elves hit adolescence, or at least the Noldor did. All adolescents try to rebel against their parents/guardians in some way or the other, and that was exactly what the Noldor did.
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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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