The rape scene was a shit tier fanservice for some twisted fucks, no lewding Liona anymore!
When Inhumans appeared they were hostile, some reality meddling happened during that time which helped them appear like they always were a part of history, from being treated like gods (Egypt) to alter key history figures.
Humans were warped, clearly depraving them and act immortal.
They, Inhumans, rewritten history to make Earth habitable for them, even allowed for them to cross-breed due to Arborian's ability to easily blend species. Remember how Glorya easily fucked those ant and mole Inhumans, then gave birth to those digging-bio-chimeras?
Perhaps the "Shwarz Katastrophe" was the first wave to shatter Earth defenses so Inhumans would easily invade? It not only destroyed our ability to discover or even destroy their "moon spaceship", but also wiped out large portion of human population.
Is it bad to genocide those who made genocide, just because they're reaping the spoils, completely forgetting what the did at first and act innocent?
Or perhaps it's all lie to fuck over Ryou.