[Valakas_]

And what makes them being "stupid" and "greedy"? One's intelligence is determined by genes, and greediness is a trait that natural selection has favored for millennia. This is just natural selection taking its course, and it might lead to our end.

If you want to blame something, blame math. Math has determined the physical constants and equations that determine the chemistry and ultimately biology laws that has resulted in humans being the way they are.