Konrad Lorenz is an outstanding zoopsychologist and a Nobel Prize laureate in Physiology and Medicine. “Aggression, or So-Called Evil” is one of his most famous works, where he examines aggression through a wide range of biological species—aquarium fish, rats, geese, wolves, and finally human beings—and arrives at a paradoxical conclusion: deep personal attachment arises only in communities where aggression levels are high. Where there is no aggression, there is no strong friendship and no true love. So can aggression really be considered evil, and suppression of aggression—good? And can humanity continue to develop if we completely refuse to be aggressive toward one another?