The research is devoted to the constructive analysis of the phenomenon of a «blind spot» in the context of a political reflection of social-historical events and which is part of the thinking. It has a dual nature which influences the formation of our judgments. In the article, it is shown that the action of a “blind spot” belongs to belief. On the one hand, it provides a possibility of the removal of historical judgment, while on the other hand, the nature of the arising doubts about the objectivity of historical knowledge is cleared up. Some of the writings of Hannah Arendt are used as examples in the analytical interpretation of the theory of the ability of judgment. The “blind spot” will paralyze critical thinking since it is a result of the absolutization of theoretical reason, and is also reflected in the political and moral estimates of history. In this research, the investigation of several political appraisals of which Arendt gave of a number of tragedies of the 20th century uncovers the specifics of the results of the “blind spot” in her thinking. The recognition and the understanding of this phenomena promotes an increasingly-sensitive relationship of the particulars of those lives in related history. This recognition softens the ideological commitment for the sake of a more equal relationship between cultures, and averts an involuntary, unintentional cultural arrogance. As a result, it is shown that the intension of the ability of judgment is reflected in the “socialization” of theoretical reason, that the phenomenon of a “blind spot” of thinking exerts an impact on an assessment of historical and political realities and allows for the realization of the value of the restriction of reason, and that the fair, humanistic conclusions of Arendt in a latent form by themselves bear a paradoxical danger of an opposition of various cultural identities.