Psychologist Dr. John Gartner joins Dash to break down the evolutionary reasons humans may be drawn into ruthless authoritarian movements. Even Chimpanzees showed an allegiance towards aggressive and often violent alpha-males. From 1930s Germany to ancient civilizations -- differing ideologies and religions continue to be pinned against one-another by powerful demagogues. Are psychological factors --  that can be traced back to our primate ancestors -- still at play?