Also, in response to the defense argument and they use living souls blah blah blah - Yes of course we have to defend ourselves, no one is arguing against that.
What the argument, at least for me personally, is that the WoL didn't try ANYTHING else. No Linkpearl to Cid, no communication to Jammingway, no message to Yshtola. 2 lines of dialogue that just gets shutdown.
We had time for gondola rides, we had time to eat fake food, we time to walk around - and beyond that time is arbitrary in the story as it is. It only took a day to fully outfit a train, we were in a rush to stop Zoraal Ja from invading again yet had time to take a tour of the city - the story can make the time if it wanted too.
Imo, there was no need to delete those people. Instead of deletion the story could've said we're simply turning off the machines that give them form - which is what takes up the Aether. The memories will remain stored and not require life essence aether to materialize, but instead will be put in a slumber. Of course that causes issues that could be addressed, but I wouldn't even blame them to go the Ultima Thule route. My goodness, if you wanted your cake and eat it too, say that those that are already materialized will be lost and give others the option to be stored, you could still have your sad goodbyes and know that those that wanted to wait weren't deleted.
It's an unncessary mess imo, and even if it wasn't unnecessary, it the story contradicting itself and left very mixed messages when taking previous story bits into account.