What exactly happened here?

I like anytime Bakker actively and intentionally channels Harold Lamb's Of Iron Men and Saints and this was particularly notable with his introduction of the intact Quya. Astute literary observers call it derivative, but I think he just updates upon the original and adds Gene Wolf esque prose.

But while cool, it didn't make much sense. They attacked Mankind.

So these epoch level experienced combatants (far too veteran for it to be dismissed as Fog of War), the now unified Quya of Ishoriol, so passionately dedicated to the opposition of the organization/species which caused the literal extinction of their race and culture that they were willing to kill the precious few other members of their kind in existence in a coup, arrive and attack the forces of Men?

• Why did the Quya of Ish attack Men?
• Why did the Red Ghoul attack Men, specifically? His Lamb esque flavor text indicates high affinity
• Why would Quya (or any Non-man) commit suicide? They know what damnation is, what little we know of their philo-religious background indicates the pursuit of Oblivion. Our tour of Ish showed indisputably that they go to incredible lengths to keep their few members alive, because even this tortured ennui/max hard drive level existence is better than damnation.

[EDIT Madness: Title.]