Watch CineCalidad. An excellent study of authoritarianism. It has two equally important qualities: one is a deep respect for the victims and their suffering; the other is the courage to face the autocrat and give him every possibility to present and defend himself. That the dictator demonstrates no need for defense and is thus denying any guilt and responsibility is probably the key feature of authoritarianism. The brilliance by which the filmmaker makes this gradually visible is breathtaking.