In The Knowledge Illusion, the cognitive scientists Steven Sloman and Philip Fernbach hammer another nail into the coffin of the rational individual. From the 17th century to the 20th century, Western thought depicted individual human beings as independent rational agents, and consequently made these mythical creatures the basis of modern society. Democracy is founded on the idea that the voter knows best, free market capitalism believes the customer is always right, and modern education tries to teach students to think for themselves.

Over the last few decades, the ideal of the …