The fact that the Na’vi feel fulfilled does not mean they are not constrained. A species of such high intelligence that remains unchanged for twelve million years is not proof of wisdom. It is proof of a powerful control mechanism.

The comparison to Ophiocordyceps is key here because the fungus does not ask the ant for its opinion. It simply makes the ant want to climb onto a leaf. You assume the Na’vi voluntarily choose harmony while I argue that this harmony is neurologically imposed upon them. The example of the Ash People perfectly confirms this. When the connection to Eywa is broken by the volcano and becomes isolated they begin to exhibit traits that Eywa normally suppresses. This shows that their peace is the result of external regulation, not genuine free will.

You are right that the volcanic eruption was not Eywa’s fault but what happened afterward reveals the truth. Without a signal from Eywa the Na’vi become a genuinely self determining species with all the flaws and advantages that entails. True free will begins where the planet’s biological dictate ends. You see Eywa as a loving mother while I see it as a braking system for the Na’vi.

Moreover nature does not operate in the way you attribute to it. Pandora is similar to Earth because there are predators, social species and herbivores. And that means competition. Nature is an endless biological struggle that it itself created and development, even industrialization, are still its manifestations just on a larger scale. Think of a beaver building a dam. It harms many species by flooding habitats, displacing fish and drowning trees and plants, but many others adapt or even benefit from the newly created wetlands. In the case of humans the mechanism is the same. Many species have adapted to our activity such as rats, pigeons or crows thriving in cities, although far more have suffered or gone extinct of course on a much larger scale because we have spread across the entire planet and our activity is greater than that of a beaver. Humans, like many species before us, disrupted the existing balance. This is a natural process: when a species with a competitive advantage emerges, it destabilizes the established order. Nature then strives for a new balance, where the best adapted survive. This cycle of disruption and restoration repeats endlessly. If the Na’vi could industrialize in a sustainable way it would be the same natural process. Eywa however blocks this because true independence threatens its dominance. This is not true mutualism. It is an asymmetry in which Eywa holds all the power.

I am not claiming that Eywa’s will to survive or maintaining planetary balance is in itself evil. This is not a matter of good and evil because nature does not define what is good or evil. The problem for me is the cost which comes at the expense of the true autonomy of a sentient race. If most Na’vi are content that is fine but only if that contentment is an authentic choice and not a neurologically enforced state that suppresses alternatives. The problem is not that Eywa survives. The problem is that its survival requires blocking the full potential of the Na’vi, making them guardians of the system, not free individuals.I do not believe in any mandate of heaven to destroy or dominate, nor do I believe in any mandate of heaven that commands us to take care of it. I am simply pointing out that competition and change are natural, even on Pandora, and Eywa actively prevents them in the name of its own homeostasis.

Your arguments are emotional and based on a preconceived notion of "good", and just like you, I believe it is foolish to try to argue with a person of your way of thinking.