When reductionism is applied to the human mind, it reduces reason to something less than reason. It says the ideas in our minds are products of natural selection (Darwinism) or economic conditions (Marxism) or electrochemical responses in the brain (contemporary neuroscience). Yet the only way a worldview can build its own case is by using reason. Thus when it discredits reason, it undercuts its own case. It is self-defeating.
