"Human beings must necessarily cooperate and aid each other in order to survive. It's how our species evolved. However, that doesn't mean humans only ever aid each other, or even that they care about others except as a means to survive. Humans will cooperate when it's beneficial and also stab their fellow humans in the back, step on them and exploit them when it's beneficial. That's why all we have are systems of elites and peasants, filled with squalor and death. But the species continues because of those systems."
doing so at the expense of others is unnatural, because humans are a social, cooperative species
Your assertion that exploiting others is unnatural is patently absurd. To repeat myself from elsewhere:
Co-operation doesn't conflict with greed. Humans can and must co-operate within society to survive but humans are also motivated to do everything they can to screw over others to ensure their genes have the greatest chance of propagating, as long as screwing over others doesn't threaten survival.
Okay, let me rephrase for you: in choosing which of Microsoft's stinking piles of shit was the least stinky, some people chose Windows 2000. However, most people just left the stinky area and didn't look back.
You're conflating growth of particular capitalists' wealth, "profit", and growth of the entire economy. Capitalism's goal is profit but profit doesn't depend on growth of the entire economy. There are capitalists who profit even while the economy shrinks.
OP's meme was referring to growth of the economy, not profit. Again, capitalism doesn't depend on growth (of the economy).
I have not used the word "desire".
It is not false. Again, it is evolutionary psychology.
The need to increase one's chances of survival and of passing on one's genes is always present and is not limited to stressed conditions.