Reasons for his feelings, yes. His actions... not so much. He feels justified in them... in everything that he has done, and striven for, for the sake of reviving his sister. He places all humans into that same category... he judges them harshly because he expects to be judged in return, despite being from different worlds and having different experiences.

I am hoping that his experience with Sayo is helping him learn... but should he act out against anyone in the village again, we'll just find a way to put him back in the tunnels, that's all.