One Concept Slavoj Zizek Missed

I finally had the opportunity to listen to the youtube video and consume the information. I agree with many of Zizek's assertions and his reasoning is quite sound. I do think that the large catastrophic issues that we face as a species must be dealt with in the next century. It is merely not a question of whether or not we should address them; we are being forced and compelled to address them because they are unavoidable. No longer may we simply ignore all of these pressing issues.
One "hole" in the capitalist ideology stands out in my opinion. Zizek, I believe, would agree with me. There are two fundamental assumptions that are essential to the capitalist economic system's functioning and our understanding of the way that markets operate:

1) People act rationally and act to maximize their own self-interest
While this is certainly true of perhaps a majority of the decisions that individuals make, especially in regard to economic decisions, we cannot ignore that individuals DO NOT always act to fulfill rationally self-interested ends. Zizek spoke about an inability of humans to realize the ecological disaster we are facing in the 21st century. I find this to be quite true. We as a species must realize that there are catastrophic ecological circumstances that must be dealt with for the rest of this century. We would only be acting in our own rational self-interest if we attempted to fix the ecological nightmare our predecessors have created. However, our predecessors' disaster was the result of many, perhaps billions, individuals making minute, self-interested decisions that accumulated to create our current set of ecological circumstances. If we are to address ecological issues, the focus on the individual rather than the collective must be abandoned. To solve our ecological problems, we are forced to make choices in pursuit of our own rational collective self-interest as a species.
2) The Scarcity of Resources and Unlimited, Exponential Growth
The capitalist economic ideology assumes that resources are scarce and there are definite limits to the total amount of every resource. The ideology explains that this is the primary reason why markets operate: they facilitate the allocation of scarce resources. In addition, the entire system is only considered to be working well (the healthy capitalist system) when there is growth. In fact, the capitalist ideology ultimately assumes that infinite growth is sustainable forever. The contradictory nature of the two previous claims is quite evident. How can a system that recognizes all resources are scarce additionally assume that infinite growth is sustainable forever? Infinite growth essentially relies on infinite resources; the entire market system operates as a result of the scarcity of resources.