What are the conditions under which the legitimacy of a regime ends? My interest in this question is derived from its particular historical instance concerning Eichmann's case - a case which brought forth the question of whether the Third Reich was illegitimate and in turn - whether Eichmann was breaking some moral law when perceiving the Third Reich as a legitimate regime.
More particularly, Eichmann's case, when perceived through the prism of the question of the legitimacy of the Nazi regime, accentuates a seeming conflicting state: in order to be a good citizen Eichmann allegedly had to follow the Nazi regime, yet he later was judged for crimes against humanity. In his trial he threw responsibility for his deeds on the loyalty he had for the Nazi regime, hence implicitly he had assumed the legitimacy of the Nazi Regime. But putting him to trial rather captures the contrasting assumption. Thus the question of what makes a regime's legitimacy end arouses.