Quote Originally Posted by Necrotica View Post
The surviving Ancients were morally obligated to free the souls trapped in Zodiark. They had to save their own people.

Sacrificing new souls for that purpose is easily justifiable as they have no obligation to protect those new souls. Would be like a government killing foreigners to save its own citizens. Very basic concept.

If they wanted to go the humanitarian route they could eventually go for some kind of soul rotation. Every x number of years sacrifice new souls so the ones inside can get a break.
They believed themselves caretakers of the planet, and must do what is best for the planet. If new life was formed by the planet itself, then shouldn't it also be taken care of instead of casually throwing it away? The second they decided that it was okay to sacrifice that life, they forsook their roles as caretakers and basically tossed their entire reason for their society's existence out the window. At that moment they lost any and all moral high ground and became something which even Azem would likely have to acknowledge, they became a threat to the star itself.