Emet- Selch was fighting for his world, where our characters were fighting for our own. His words and condemnation of the fleeting existences he sees before him are not without some bias—-he is seeing his own world warped and twisted into something that in his eyes will suffer forever, never reaching the height of his people...
And to him, Ascians are made throuh being like him uplifting other shards of the souls of his former people into the original article. But unlike other Ascians he has fashioned together, we take that final step into becoming his equal in spite of his actions, representing a conclusion never would have considered seeing again.
In the end, he wanted his people back. His people, who were so...advanced they had their own fragilities with the first war, the first calamity, the first primal. Perhaps it was too much for someone to admit that, for all of the advancements of his society, summoning beings such as Zodiark and Hydaelyn was the moment their feats of creation magic had grown out of their control. It wouldn’t surprise me if said creation magic may have been the cause of the carnage that put their world in jeopardy, much like how in our world people still debate over man’s involvement in global warming.