I think you missed some clear points, and while other people have pointed them out to you. You have ignored or still not understood them. So lets try a different way
AI sphene was overwriting endless sphene, who after their time with us was fighting to not kill others to keep the endless alive by then end of it, even asking for our help once convinced that it was wrong. AI sphene said that endless sphene was too weak cause they no longer were putting the endless over the lives of others. In order to try and stop AI sphene from overwriting real sphene, and take a way and weaken sphene was to turn off the towers. Without turning them off AI sphene would be able to use the computing powers and access to the soul stored. The same things that were storing the rest of the dead souls.
Without getting into the moral argument of AI, The endless aren't even AI. The main point of every section was essentially unlocking the memories of the npc's we met. Once their memories were restored they asked to be turned off. Because they were mere facsimiles of themselves and not real. Every section we met npc's who had heavily altered and controlled memories. They were not real versions of them selves, they were stuck in loops created by the system. They weren't even AI at this point they were merely programs. They would not have had a peaceful natural expiration because the coding would not have allowed for them to know this. Their memories were altered to the point that anything "bad" was removed. The idea that they were consuming other lives to keep themselves sustained was absolutely appalling to every endless that had their memories "restored".
This is also different from the previous expansions argument which was, our souls were divided up into fractions creating whole new people in the process. To the Ascians, rejoining them was restoring people to their "whole selves" and not murder because the souls weren't dieing or going away, they were just rejoining. Because if were simply looking at souls and not people. No one was actually dieing. Also Emet put us on this path here, telling us to go here, most likely knowing we would have to go through this. That was what made their story so compelling is because we could understand their motives and feel for them. They just wanted their friends back, which was possible. however this would result in killing every new person that had been created thay had become a person and lived a life they chose. Which is what we Showed Emet in the end. These weren't new people. They couldn't build lives of their own that existed outside the programming they were given, where as AI that has become sentient is capable of making these decisions.
Even if you still want consider the endless alive and people. We made the exact decision we made at the end of Endwalker. In order to save the lives of many, we had to put a stop to the few.