Its a matter of perspective then, and we have to agree to disagree.
Emet never dismissed the fact that we struggle, and that his position towards us is unjust from our view. He argued with us. He presented his case and evidence, and refuted our arguments. His very shtick was, that if an individual or a race as a whole proved to be worthy enough to replace his people, he would go with it. His criteria were harsh but he did have the option in place, and it didn't require a full amaurotian soul to clear them either. Thats the very thing that happened in the Tempest: we championed the cause of our people against his plans and the resurrection of his people, he accepted the challange (basically making him the champion / hero of his race) and we won. And in the end, he accepted that.
I can sympathize with and respect an intelligent monster without agreeing with him, while also actively fighting him. I could pity him too for his circumstances, but pity is also an insult, coming from a position of superiority. A twisted monster, victim to circumstance, functioning on feelings and instinct instead of reason? Its hard to respect or sympathize with that.
People argue that they would never do the same thing in his place; killing possibly billions over millennia, and I would usually agree. But many of these people forget that in this case there IS a tangible difference between an Amaurotian and a shard dweller. Is it significant enough to dismiss the lesser as "living"? Now that can be up for debate, but apparently for Emet the line is at 9/13 souls. For a run of the mill 1/13 soul shard dweller Emet is not unlike a lesser lovcraftian monster in comparison. Its hard to imagine such a difference between two sentient races in the real world, and thus we argue from the viewpoint of the one closer to us.
For me and many others, imagining such a viewpoint is enough to answer: maybe we wouldn't be better.
tldr; Choosing your own fate, no matter how horrible the choices are; if well reasoned enough, I can respect. Having no choice or freedom of will, leading to tragedy? That only begets pity from me.