Evolutionary Psychology, an offspring of Sociobiology, claims to explain human mental (psychological) functions on the basis of evolution theory. Researchers in the field try to monopolise Darwin for their purpose by calling themselves Darwinists or by putting his portrait on the cover of their books. It is shown that Darwin, who actually tried to explain some human behavior, like altruistic behavior, in the context of evolution theory, found the intellectual and moral faculties to be predominantly shaped by sociocultural, not biological factors, however. It is also shown that the tendency to reduce mental functions to biological ones, biologism, affects many fields of inquiry to their detriment, such as education, criminology, psychiatry, or philology. Biologism’s dehumanising effect on our view of the human condition is the dominant topic of the book.