The war is only one part of the story being told.
Before the plague appeared the Finite Galaxy was nearing utopia, and they had reached a place where species of all sorts had come together and formed positive ideals towards sexuality, self, acceptance, among other things.
They are not going to abandon those aspects because of the war, nor should anyone let go of the beauty of their lives even when they fight to protect them.
I am sorry if you think that being able to showcase both in this story doesn't mesh with you, but we won't be removing the core ideals I strive to achieve, and if I fail at doing so, then I shall fail with at least trying.