I don't think that the Ainur purposefully created the spiders. As I said before, they were most likely creatures that Morgoth twisted from something else. Or, they could also have been lesser, but still evil, Maiar that also chose to take the form of spiders just like Ungoliantë.
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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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