The nations were all born pure-hearted, just like human babies. They remain entirely pure-hearted throughout their whole life if no human taints them. They can go through huge natural disasters and emerge the same, but war, human war...

It can taint their hearts to the darkest shade of black.

Deep down, even under the thickest black cover, there will always remain some pureness, because that's how they were born. Ultimately, nations are considered good.

When it comes down to it, they will make the right decision.

So long as no human diverts them from it.

The very first to be really tainted by humanity was not Ancient Egypt, nor even Ancient Greece or China, but rather the Roman Empire.

Humanity's first true horrors took place there, and the rest of the world followed suit.