This also demonstrates why the Capitalists (those who hold Capital) are so out of touch with humanity as a whole, they are the closest to their god, Capital, than anyone else, and thus are it's greatest personification of it's nature. It's very embodiment of alienation, seeing everything within the binary view of "those that exploit" and the "cattle to be exploited". And yet at the same time they are not really in charge, they are puppets to their god, Capital, this thing that isn't sentient, isn't even alive, but that has rules, rules that they too are forced to follow lest they become "lowly cattle" like the rest of us, and the closer they are to Capital, the further from humanity they become and may even see it's loss as a "fate worse than death".
And so from their twisted view, a billion people, "cattle", dead, is a small price to pay if it can even give them just a small chance of staying close to Capital, and protecting it against the rebellion of humanity casting off it's yoke. Making us Communists, who seek to free humanity, and who has the tools to do so, it's greatest enemy.
Of course we Communists know that the seeds of a systems destruction exists within that very system, and that the death, one way or another, of that system is inevitable, as nothing is eternal, but for the Capitalists who are closest to Capital, seeing the death of the system the same as if it was their own death, and who have little connection with humanity for which they are so a odds with, see it's death as the death of everything, as it is all they hold dear, all that matters to them, and so terror drives them to mythology, to see Capitalism as eternal, or at least as something they can make eternal, to keep the reality of it's loss at bay. It is also why when it is collapsing they get more and more unhinged, they are checking themselves out from reality as they get more desperate, as it becomes harder to deny reality, they must insulate themselves from it further.
Edit: I think that maybe existence itself would be the one exception from nothing being eternal, as actual nothingness can't exist as it is completely self contradictory at the most basic, conceptual level, meaning you can't get something from nothing, and that means that anything that does exist must have derived from something else that exists or existed. It's that basic physics law of "energy cannot be created or destroyed, only changed from one form to another", that some form or another of "existence" must have always existed, but the forms within it change and aren't eternal, and with humans being entirely the result of the configuration of atoms in a certain pattern, as a result of a long, slow, stupid process of evolution, and thus also not eternal. However, humans don't exist alone, but as a whole with the conditions of the universe itself, so we pass on knowledge to our children, and eventually uncover the nature of reality, IE "advance science" and so eventually travel amongst the stars, do what would have been thought impossible before, because a thing is greater then the sum of it's parts as it's configuration enables it to do things that those parts could not do alone, humanity across generations do things no single human could before even have dreamed of.
Edit Edit: Or maybe I should say "energy" rather than "existence", but things are getting a little removed from the concert here, and I don't have a deep enough understanding of physics to go deeper so maybe I should stop.