Oh, the WoL doesn't sacrifice other people! No, we sacrifice ourselves! And other people definetly notice!
One of the main reasons people love us and want to be like us is because we are not a hypocrite. We don't tell other people to sacrifice themselves for us. We don't even ask them to. Instead we deny our own wants a lot of the time to try to solve other people's problems by ourselves. And are then shocked when those other people we were helping out also sacrifice themselves for us. We never have asked anyone to save us. Not Minfillia, not Moenbryda, not Harchefaut, not Yasale, not the people of the doomed time-line, etc. But they still did it anyway.
The truth of the matter is, sometimes we are the "other person" whose problems someone else is solving. And denying people their right to chose to sacrifice themselves would make us the biggest hypocrite of all. Everyone needs to be saved sometimes, even us. But we've never forced anyone to save us; everyone who has done that has decided to all on their own. But it's also undeniable that without our example, a lot of people wouldn't have been inspired to give of themselves sacrificially just like we do. How types of Tempering works depends a lot on the Primal doing the Tempering. Even Ifrit, who mainly has a kind of Tempering that robs people of any personality, is capable of Tempering people subtly to the point no one knows they are Tempered until that person brings the Amalja'a down on their heads. We see a very broad range of Tempering effects throughout the game. Lakshmi is probably a Primal to consider as she can Temper people while not outright destroying their personalities.
Zodiark just seems to have a very subtle form of Tempering that just seems to "nudge" what the Convoction wants. Everything the Convocation does after they summons Zoidark ultimately results in Zoidark gaining more aether. The "why" of why Zoidark gets aether shifts around a bit, but the solution is always "give Zoidark more aether so he can fix our problem for us". I have no doubt that Emet-Selch and the Unsundered Ascians genuinely loved their world and their people and genuinely missed them. I do think Zoidark played a part in blinding them to other realities around them (like the other races that came after the Ancients being people) so that they would think he was the only way to "solve" their loss. And for Zodiark to solve that loss, he needed aether... What I think happened is that Azem stopped staying neutral and did pick a side... which wasn't Zoidark's. Azem's entire role centers around going around the world and solving people's problems. Which probably gave Azem a much different perspective on the Last Days. So there was probably a lot more reasons than just "summoning a god is bad" that led Azem to not wanting to summon Zoidark.
Once Zoidark and Hydaelyn are both summoned though... there's no way to put the genie back in the bottle probably. One off them was going to end up as the Will of the Star most likely. So it was probably a question of "between Zoidark and Hydaelyn, which one would be less bad for the world in the long run" and Zoidark had already effectively asked for aether equivalent to half the current population of the world after being summoned... and even after getting all that aether, he had asked for more aether, to the point the Convocation was willing to deliberately raise life up only to sacrifice it later. Meanwhile, Hydalyn just wants Zoidark sealed and for him to leave the world alone. So I think Azem picked the least worst option at the time. Or for all we know... Hydaelyn Sundering Zoidark was the 3rd Option Azem came up with...
Fortunately, I think we'll get a good idea of what Azem really did back then. Emet-Selch made a memorial crystal of his memories of us after the Sundering happened. And our signature Echo ability is seeing into the past of people and objects...