In other words, they see the "life" that is not the 1/4 of their people to be lesser beings. Which tracks with what Emet-Selch keeps ranting about, and which the short stories have illustrated that Azem deeply disagrees with.
The motivation of the "dissenters" who summoned Hydaelyn was also mentioned by Hythlodaeus in 5.0. In Anyder in 5.2, we are given another motivation, that Zodiark cannot "forestall the doom" of the Ancients. I strongly believe these motivations are entirely compatible; specifically, I read the recordings in Anyder as the dissenters being aware that if the rest of the Amaurotines continued to pay Zodiark's price for every single miracle, it would lead to the end of the Ancients just as much as the End of Days threatened to.The Anyder actually say nothing about any of this when discussing their motivations for summoning Hydaelyn amongst themselves. They say they intend to summon Hydaelyn because the summoning of Zodiark didn't bring a permanent solution to ending the threat of the Sound. We don't know what that entails, why they believed this or what if anything they even knew of the Sound, but they don't really say anything about the Convocation's intent to sacrifice proliferated life being relevant to their plans.
As far as I know, Hythlodaeus's commentary on Hydaelyn's summoners has not been explicitly contradicted.
Which assumes that Emet-Selch is astonishingly oblivious and uncaring about where Mitron and Loghrif had gone, if he didn't check out the Flood of Light in the first place to find Eden, and, considering his much-vaunted soul-sight, recognized Mitron's soul in there.This is what he says, we have no reason to believe he's correct. It's true that the Unsundered considered the sundered Ascians as being expendable, because from their perspective they can simply be reraised once again at a later date, but as to his belief that Emet knew his situation, Emet himself says that he believes both of them were slain and that he is the only Ascian on the First.