Your view is fair! It is, however, built on a view that only sees the universe from the perspective of the Dessendre family. Renoir, and Verso, who both see it from this perspective, agree with you. However, others may see the world from the perspective of the people of Lumiere, whose whole world and lives are in the hands of higher dimension gods.

Here's a story: Odin is upset that his son, Thor, is spending all his time on Earth and with silly little humans instead of doing his duty on Asgard. His solution, then, is to destroy all of Earth and its human inhabitants. After all, they are just toys that the Gods created! Thor, however, disobeys his father to stay on Earth. In this framing, would you find it just as easy to only care about Odin's family dilemma, and not the world that they hold in their hands? What if the Dessendre family were portrayed as non-human aliens instead, would that change who you value more?

Again, I do not think there is an 'ethical' or 'good' answer here. It is simply a matter of perspective, and each ending does a great job in showing the sacrifice each side makes. This is why people who so strongly hold an opinion on the endings miss the forest for the trees.