Originally Posted by
Layte_Aeon
At that point Zodiark was also like a machine without a driver, something that can be dealt with if one has the means to do so.
Zodiark himself did what was required of him yes, but at the accidental consequence of tempering his summoners, a side effect of creation that big performing feats of that scale. That, combined with his summoners desire to sacrifice other life, life that didn't volunteer to do so ultimately means he can't be left to be. After all when one tempers the actions of their resulting fanclub are rather intertwined with said being.
And as Hydaelyn herself admits her actions were neither kind or righteous, but at that point what would hating and blaming do? The sundering happened, tragic and horrific as it was, and now new life exists and thrives. The Ascians goals, for as understandable and relatable as their reasons are, will mean the end of the current world and everything upon it. Notably by the end not even they are hated by the main cast, they just accept that their goals are incompatable, while Hydaelyn's aren't.