Why am I talking about evolution in Introduction to Psychology Class?

Dr. Bloom asked his Psych 101 students at Yale that very question. He states:

"The good question to ask is, 'why am I talking about evolution in Introduction to Psychology class?' And the answer is that there are two ideas which come together. And in fact, they're both of the dangerous ideas. One idea is that Darwin's idea--that biological forms evolve through this purely physical process. The second idea, the rejection of Descartes, is that our minds are the product of physical things and physical events. You bring these together and it forces you to the perspective that what we are--our mental life is no less than the eye, no less than camouflage, the product of this purely physical process of natural selection. More to the point, our cognitive mechanisms were evolved not to please God, not as random accidents, but rather for the purpose of survival and reproduction."