Youre projecting your values onto others a little too much at the end there. I think the nihilism in most cases is largely tongue-in-cheek, and there is enjoyment and satisfaction to be had without spawning spawn, too, dying alone - we all die alone! - included. Id argue there is equal, but different, enjoyment to be had without being tied down!*
Youre right on with much of the rest, but as pointed out by
@neffa3, nothing is going to change until/unless its too late. Its just not, not at a macro scale. Thats, of course, not a reason not to try at the micro level (reducing, reusing, recycling, making tee shirts, etc.), nor is it a reason not to spawn if thats what makes you happy.
*And, I like them well enough, the small humans. I took my little niece out shooting for the first time this past weekend, along with her older brother who comes with me whenever he can and is excited to do the apprentice hunter program with me next season. Both of them browns, Ill add. Both my brother and sister married immigrants and spawned spawns -- math, as you said - plus its the Merkan way! - borderwalls be damned.