COMPUTATIONAL FORENSICS·2026-03-01· 18 min read

The Forensic Narrative Diff: Separating Physical Invariants from Moral Emplotment

A computational framework for measuring how identical physical incidents are reframed into opposing ideological myths.

By The Narratologium Computational Lab

Abstract

“When historical events occur, the physical record (ballistics, timestamps, telemetry) provides only raw coordinates. Narrative engines immediately impose agency attribution, victim designation, causal ordering, and metaphorical framing. This paper formalizes the Narrative Diff metric, demonstrating its application across the Boston Massacre (1770) and the Gulf of Tonkin (1964).”

I. The Invariant vs. The Plot

Every narrative diff begins by establishing the physical invariant layer: verified timestamps, ballistic trajectories, geographic coordinates, and material remnants. Against this substrate, we map the rhetorical divergence across competing contemporary accounts.

Embedded Forensic Narrative Diff

Physical Invariant LayerMarch 5, 1770

The Boston Massacre / Incident on King Street

Physical Facts: A crowd of Boston colonists pelted a British sentry with snowballs, oyster shells, and ice outside the Custom House. Additional soldiers were summoned. In the chaotic noise and shouting, muskets were discharged without clear verified command, killing 5 civilians and wounding 6.

“Narrative transforms a chaotic street skirmish into an ideological catalyst by flattening moral ambiguity: defensive panic is recast as tyrannical malice, and street brawlers become spotless civic martyrs.”

Primary RecordMarch 12, 1770

Captain Thomas Preston's Deposition

Captain Thomas Preston (29th Regiment of Foot) (Sworn legal affidavit before Magistrate)

“The mob still increased and were more outrageous, striking their clubs one against another, and calling out, 'Fire! Strike if you dare, you rascals!' I was talking with some well-behaved persons who desired me to go back, when on a sudden I heard the word 'Fire!' and immediately after a gun went off... My soldiers were attacked with clubs and hard lumps of ice.”

Agency Attribution

Passive British defense; violent mob escalating acoustic confusion.

Blame Target

The rioting mob and unidentified instigators yelling 'Fire'.

Victim Designation

British sentries trapped against the Custom House wall.

Systematically Omitted Facts

• Colonial grievances regarding British soldiers competing for local ropewalk labor.

• Preston's position in front of vs. behind the soldiers' musket line.

Certainty Index55%

Contemporary ReportMarch 26, 1770

The Bloody Massacre Engraving & Poem

Paul Revere (Sons of Liberty) (Hand-colored copperplate engraving & broadside)

“Unhappy Boston! see thy Sons deplore, / Thy hallow'd Walks besmear'd with guiltless Gore: / While faithless P-n and his savage Bands, / With murd'rous Rancour stretch their bloody Hands; / Like fierce Barbarians grinning o'er their Prey, / Approve the Carnage and enjoy the Day.”

Agency Attribution

Preston actively commanding a coordinated, smiling firing squad.

Blame Target

British military despotism and Captain Preston directly.

Victim Designation

Innocent, defenseless, well-dressed Boston citizens standing peacefully.

Systematically Omitted Facts

• All colonial snowballs, ice chunks, clubs, and threatening physical aggression.

• Crispus Attucks's mixed-race identity (whitened in early prints to appeal to white readers).

• The soldiers were surrounded in pitch darkness in winter slush.

Certainty Index100%

Scholarly InterpretationDecember 4, 1770

John Adams's Legal Defense Summation

John Adams (Defense Attorney for British Soldiers) (Courtroom trial transcription)

“Facts are stubborn things; and whatever may be our wishes, our inclinations, or the dictums of our passions, they cannot alter the state of facts and evidence... The law will not bend to the uncertain wishes, the violent passions of the people.”

Agency Attribution

Mutual escalatory fear in the crucible of mob panic.

Blame Target

Systemic political friction placing military police in civilian governance.

Victim Designation

Both the slain citizens and the terrified soldiers charged under capital law.

Systematically Omitted Facts

• Partisan revolutionary agendas.

Certainty Index85%

APA 7th Edition Citations & Primary Sources

White, H. (1973). Metahistory: The Historical Imagination in Nineteenth-Century Europe. Johns Hopkins University Press.

Formalizes emplotment modes (Romance, Tragedy, Comedy, Satire) in historiography.

DOI: 10.56021/9781421415604

Lakoff, G., & Johnson, M. (1980). Metaphors We Live By. University of Chicago Press.

Foundational text on conceptual metaphor mappings across domains.