Hannah Arendt was a prominent political theorist and philosopher of the 20th century, known for her profound examinations of power, totalitarianism, and the nature of evil. Emerging from the tumultuous contexts of Nazi Germany and the aftermath of World War II, her work sought to unpack the moral complexities of human behavior, political systems, and the interplay between individual responsibility and collective action.

One of Arendt's most influential contributions to moral philosophy is encapsulated in her exploration of the concept of the "banality of evil," which she articulated during her coverage of the trial of Adolf Eichmann, a key organizer of the Holocaust. This concept emerged from her observation that Eichmann was not a fanatic or a monstrous criminal but rather an unremarkable bureaucrat who participated in heinous crimes through a blind adherence to orders and a failure to engage in critical moral reflection. What Arendt suggested was revolutionary: evil could manifest not only through malevolent intentions but also through thoughtlessness and a lack of critical engagement with one's actions.

Arendt articulated her ideas in her seminal work, "Eichmann in Jerusalem: A Report on the Banality of Evil." This text stirred considerable debate upon its publication, largely because it challenged the prevailing notions of evil as something monstrous and dramatic. Instead, Arendt proposed that evil could be a byproduct of an ordinary person failing to think critically about their role in a larger system. She urged individuals to transcend their roles as mere cogs in the machinery of state or society, invoking the moral imperative to think and question the implications of one’s actions.