*Spoilers* Anyone feel joining Emet would have been better

[Cleretic]

Again, how is it any different to when Eden we made creations just to slay them?

The Eden primals were entirely willing to be part of exactly this. Garuda and Ifrit seemed kinda pumped about it, in fact. Pretty much as morally unobjectionable as you can get.

As I've mentioned before, though, the third sacrifice was no longer 'doing what they can to ensure the star's survival'. That was the second sacrifice; while that second sacrifice was definitely not the best way to do things, after it happened the world was right back into working order, with fires put out, wind now blowing, all that. The third sacrifice, we know from the Hythlodaeus shade in Amaurot (which was basically Emet's sockpuppet, and so can be trusted to have the right idea) had only one purpose: to bring back the people that were sacrificed to Zodiark. People that, incidentally, we learned later were still pretty okay with that decision (although some of them were pretty shaken up for other reasons when we spoke to them at Mare Lamentorum).

There was no 'for the good of the star' about the third sacrifice. That was for the good of the surviving Ancients, and nobody else. And it's rather unlikely that they sacrificed nothing but entirely willing things for it, given just how many they'd need to sacrifice for such a thing anyway.