In this forest, hell is other people. An eternal threat that any life that exposes its own existence will be swiftly wiped out. This is the picture of cosmic civilization. It’s the explanation for the Fermi Paradox.”
This is pretty nihilistic, but is also obviously the theme of the book, if not the series. I have a problem with it, and it lies in the second half of the second axiom.
"the total matter in the universe remains constant"
This is fairly uncontroversial, as it is the Law of Conservation of Mass and is widely accepted as a fundamental truth of our universe. However, it can be disproven by the counter-example of the Big Bang.
This doubt can be the seeds of hope for a diverse universe. Now, back to the story...