This frequency of English localization issues is unacceptable

[ArslanMalqir]

Ignoring the fact that this has nothing to do with localization, it was never stated anywhere that the sacrifices were "new races". All the known races that live on the planet present day are races that came into being after the Sundering had already happened.

The actual quote emphasizes that the split between factions happened because the faction that was against the sacrifices wanted to leave custodianship of the world to the new life that had been created. It's not explicit, but the implication is that "new life" in fact referred to people, not just plants and animals. That would explain why there are so many races in the modern day while back around the time of Amaurot before the Final Days there was only one race.

I don't hate Venat. I find the writing around her to be very questionable. Especially after a decade of certain posters and the game itself swearing up and down that no matter how sympathetic the plight of the antagonists happen to be, certain red lines could never be crossed. Then the pretty 'mOmMy' character crosses the same red line and suddenly it's perfectly acceptable to partake of genocide.

Venat making the decision to Sunder the star after all her efforts at convincing other Ancients to not sacrifice innocent new life so they could enjoy a false paradise is not the same as the Garlean Empire deciding to drop a meteor on or gas Eorzea to wipe out all life on it in the name of a conquest built on the idea of racial superiority, or the Ascians deciding to wipe out all life on 14 worlds because they think all new life is inherently inferior to them and they want to go back to their world. It's not about whether or not Venat was justified, that is explicitly left up to you to decide, it's about understanding why they did what they did and coming to terms with it because it can't be undone.

Also—please really consider the argument you're making here, because genocide isn't justifiable. It doesn't actually matter how sympathetic or understanding you are of who did it or why it happened, it's still a horrible thing.