“Zero Degrees of Empathy” With the term “Skinhead” tattooed on the back of his head, this man awaits trial in Germany for committing neo-Nazi crimes against foreigners and liberals. Clinicians sometimes confront extreme racism and intolerance in their practices, particularly among clients with paranoid, antisocial, and certain other personality disorders. Famous developmental psychologist Simon Baron-Cohen proposes in his book Zero Degrees of Empathy that the common element in all such behaviors is a total lack of empathy.