Humanity: A Moral History of the Twentieth Century
Humanity examines the twentieth century's worst chapters — the trenches of the First World War, Hiroshima and Nagasaki, Stalin's gulag, the Nazi camps, Mao's Cultural Revolution, the Rwandan genocide — and asks a single diagnostic question: what made participation possible for ordinary people? The answer was not a theory of evil. It was a taxonomy of erosion. Glover identified the specific mechanisms through which moral restraints loosened: the suppression of the human response by distance and categorization, the diffusion of responsibility across institutional structures, the incremental slide through which each small concession made the next one easier, the tribal loyalty that replaced independent judgment with group identity. The book is arranged not chronologically but analytically: each chapter diagnoses a specific mechanism through case studies that span multiple atrocities. The result is a diagnostic manual that applies to any institutional context where harm is produced at scale by ordinary agents — including, On AI argues, the AI-augmented workplace.
In the AI Story
Humanity occupies a distinctive position in moral philosophy. It is not a work of ethical theory; Glover argued explicitly against the view that atrocity is best understood through the elaboration of moral principles. It is not a work of history, though it is deeply grounded in historical evidence; Glover's concern was not to establish what happened but to diagnose why it happened. It is closest to what might be called applied moral psychology: the use of historical evidence to identify the psychological mechanisms of moral formation and failure, with specific implications for institutional design.
The book's method is Glover's: identify a specific mechanism, trace its operation across multiple cases, propose structural interventions. The method's rigor lies in its refusal of easy generalization. Glover did not argue that all institutions produce atrocity. He argued that specific institutional features produce specific mechanisms of erosion, and that understanding the specificity is the precondition for effective response.
The book's central finding — that atrocity is produced not by evil but by erosion, through identifiable mechanisms operating in ordinary institutional contexts — has been influential across moral philosophy, political theory, military ethics, and now technology ethics. Its extension into AI ethics is the project of On AI, which treats Glover's framework as the most precise diagnostic apparatus available for understanding what institutional AI adoption does to the moral formation of the people who participate in it.
Glover's prose is characteristic: quiet, patient, devastating in its precision. He does not editorialize. He lets the cases speak, and the cases, once read through his framework, speak with unusual clarity. The book's lessons are uncomfortable because they do not permit the reader to distance herself from the perpetrators. The perpetrators, Glover insists, were ordinary. The reader, Glover insists, is also ordinary. The institutional conditions that produced the atrocity are conditions that can, in modified form, be produced elsewhere. The diagnosis is not consolation. It is a warning — and, for those willing to hear it, a blueprint.
Origin
The book emerged from Glover's decades of work on applied ethics and moral psychology, crystallized by the post-Cold War moment when the twentieth century could be surveyed as a whole. The immediate catalyst was the series of atrocities in the 1990s — Rwanda, Bosnia, the revelations of Cambodian and Soviet violence — that made the question why did the twentieth century produce so much organized cruelty? unavoidable for anyone working in moral philosophy.
Glover's approach distinguished itself from competing accounts by refusing both the evil-as-exceptional framing (which treated perpetrators as monsters outside the normal human range) and the evil-as-universal framing (which treated atrocity as the expression of a universal human capacity for wickedness). His framework occupied the middle ground: atrocity is produced by ordinary agents within specific institutional conditions that produce specific mechanisms of erosion. The framework is harder than either extreme because it refuses the comfort of distance from the perpetrators while also refusing the fatalism of universal guilt.
Key Ideas
Not a history of evil but a diagnosis of erosion. The book's analytical structure is mechanism-focused rather than event-focused.
The human response as baseline. Atrocity requires the suppression of a specific, ordinary human capacity — the involuntary recognition of other persons as persons.
Institutional specificity. The erosion mechanisms are produced by specific institutional features that can be identified and modified.
Identity-dependent moral action. The person who acts morally is the person whose moral identity has been built through the choices that such action requires; erosion of identity precedes and enables erosion of action.
Practical orientation. The book is not merely descriptive. It is oriented toward the construction of institutions that sustain moral resources rather than suppress them.
Appears in the Orange Pill Cycle
Further reading
- Jonathan Glover, Humanity: A Moral History of the Twentieth Century (1999)
- Hannah Arendt, Eichmann in Jerusalem (1963)
- Christopher Browning, Ordinary Men (1992)
- Primo Levi, The Drowned and the Saved (1986)
- Tzvetan Todorov, Facing the Extreme (1996)