It's an interesting point of view, but the assumption that human society is bound to replicate internally the natural law of increasing entropy is quite the naturalistic fallacy. Until now, there hasn't been, to our knowledge, rational processes in our universe, capable of self reflection and decision making regarding their own behavior and organization, so past observations are not really relevant.

Sure, humanity is just another physical process that will ultimately dissolve in a high entropy lukewarm soup, but as long as we have access to low entropy, high energy density sources, we can buck the trend and choose to do quite unoptimal things, such as assigning individual rights to every individual, even those unfit for reproduction.

Zooming out past the current Stelliferous era of the universe and into the distant black hole and dark eras might risk losing quite a bit of nuance about humanity's nature and destiny.