Humans actually aren't responsible for any of this, but androids are just as capable of mistreating their own as humans were of mistreating their own. And this was all set up and done to them by another android, which is Nightmare Fuel itself. Not only that but the whole project was designed to end with the complete destruction of the YoRHa androids should the Forever War swing in their favour.

Made all the worse in Route B where it is revealed humans have already been extinct far before the events of the game and the entire war the androids have been fighting has been based on a lie.

It goes to show how badly the androids were treated.

And in the ending of an early sidequest, 11D laughs in disgust if you tell her about the death of her lover and teacher 11B in a failed AWOL attempt.

While 2B and 9S are fighting on the surface, 6O sometimes jives in with talks about fortune telling or how her senior rejected her love confession.

The Uncanny Valley the machine lifeforms bring not by how they look but how they talk, their voices are all the same monotone voice and yet they can convey anger, fear, sadness and even religious zealotry through it.

It's unclear what is worse: the simpleton machines that managed to overwhelm humanity, or the humanity who kept trying to retake Earth over and over again for centuries at all cost.

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Nier automata model rips