Originally Posted by
Iscah
You're assuming Hydaelyn deliberately shattered the worlds with malicious intent. We don't know that for sure.
We have no idea of the details of how it happened, or what Her intent was. She might have believed She was acting correctly and only intended to push out Zodiark, only for that act to have a run-in effect. Maybe it was deliberate to prevent a greater disaster, whether genuine or perceived.
Whatever the reason, it's not fair to judge until we have at least heard both versions of the story. There is still a lot we don't understand.