Maybe....I'm going to suggest something a bit mad here but bare with me.
The act that Kaguya took by eating the fruit......could it be that when she consumed part of the fruit she only ate a small part of it.....say along the lines of your idea with the spiral representing light and the anti-spiral representing dark. Lets say she ate the light part of the fruit....ruining the balance of the god tree...the light half of the juubi's will is lost within Ninja kind?
The design of the fruit is quite interesting, the tree with two halfs on either side probably light and dark. Kaguya looks to be about to eat the light half of the fruit. When that happened the balance of the two wills of the juubi were overturned and the juubi was enraged....or driven mad.
Its also a possible explanation for this so called inexplicable will that Naruto has....could it be considering that the Uzumaki clan has a spiral symbol representing it, that this "light" will of the juubi has been passed down through the generations to Naruto and those like him?
Excellent observation. Yes, it could definitely be due to a balance issue. One of the things I was hypothesizing about, but never turned it into a full theory, has to do with the Yin/Yang relationship of light/darkness.
I hypothesized that she at the
whole fruit, and that, as a fact about reality, even though she only desired the light,
the darkness automatically came with it.
This was Madara's explanation, "Whenever there is light, there is also shadow."
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This fact about reality is, I believe, connected to the Shinju, specifically the Fruit. It's as if the Fruit has some mystical ability to affect reality. After Kayuga stopped the wars and Hagaromo sealed the Juubi, human wars became worse, almost as it was planned out in retaliation.
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The Shinju, as the true god of the NarutoVerse is beyond just the tree and eye construct. Even when sealed away into the moon, it's godly will still weights down on humanity like an iron fist.
The Shinju will, via Fruit, is what is causing the wars to "spiral" out of control. Perhaps this is the antispiral side taking into effect.