(AND WHERE PEOPLE WHO DIE LATER FIT IN)

1. ON‑SCENE FATALITIES

These are the easiest for all systems to count.
If someone is declared dead at the scene, every dataset — GVA, Everytown, Mother Jones, FBI — includes them.

Reporting dynamic

On‑scene deaths are immediately visible to police, media, and databases.
They become the “official” fatality count within minutes.
This creates a bias toward instant, visible outcomes.

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2. PEOPLE WHO DIE LATER (HOURS, DAYS, OR WEEKS)

This is where the definitions diverge.

GVA (Gun Violence Archive)

• Yes, they update counts when victims die later.
• They track hospital updates, coroner reports, and follow‑up news.
• A shooting with 3 injured can become “4 killed” days later.

Everytown

• Yes, they update when later deaths are confirmed.
• Their definition includes both killed and injured, so the event remains a mass shooting either way.

Mother Jones

• Yes, but only if the death fits their narrow criteria
  (public, indiscriminate, non‑domestic, non‑gang, etc.).
• If someone dies later but the event was excluded for other reasons, it stays excluded.

FBI

• Yes, but only for “mass killings” (3+ fatalities).
• If later deaths push an event over the threshold, it becomes a mass killing retroactively.

Reporting dynamic

Later deaths are under‑reported because:

• media attention fades
• follow‑up stories are rare
• databases rely on secondary reporting
• some victims die weeks or months later from complications

This means the true fatality burden is always higher than the initial numbers.

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3. INJURIES (NON‑FATAL GUNSHOT WOUNDS)

GVA

• Counts all gunshot injuries
• Includes grazes, through‑and‑throughs, and serious wounds
• Injury count is updated as hospitals release information

Everytown

• Counts injuries in their definition
• Injury totals are updated when new information emerges

Mother Jones

• Does NOT count injuries
• Injuries are irrelevant to whether an event qualifies
• A shooting with 20 injured and 0 killed = not a mass shooting in their dataset

FBI

• Does NOT count injuries for mass killings
• Injuries only matter for “active shooter” reports, not mass‑shooting statistics

Reporting dynamic

Because injuries are:

• medically complex
• slow to confirm
• often under‑reported
• sometimes not disclosed due to privacy

…injury counts are always incomplete in early reporting and often remain lower than reality.

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4. PEOPLE WHO ARE INJURED AND DIE MUCH LATER

This is the biggest blind spot.

GVA

• Will update if the death is reported publicly
• But if the death occurs months later, it may never be captured

Everytown

• Same dynamic — depends on public reporting

Mother Jones

• Only updates if the event was already included
• If the event was excluded for other reasons, the later death does not change anything

FBI

• Only updates if the later death pushes the event into “mass killing” territory
• Otherwise, it is ignored

Reporting dynamic

Victims who die:

• after multiple surgeries
• from infection
• from organ failure
• from complications
• after long ICU stays

…are often not counted in mass‑shooting fatality totals.

This creates a systematic undercount of deaths.

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5. WHY THIS MATTERS

Because the system’s logic is:

“If the injury didn’t kill you immediately, it doesn’t count the same.”

This mirrors the interpersonal minimization pattern:

“At least he doesn’t hit you.”
“At least no one died.”

Both collapse violence into instant, visible harm, erasing:

• long‑term medical consequences
• delayed fatalities
• chronic disability
• psychological trauma
• community‑level impact
• the coercive meaning of the act

A person who dies three weeks later from a gunshot wound is just as dead,
but the system often treats them as statistically invisible.

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6. THE STRUCTURAL TAKEAWAY

Mass‑shooting data is shaped by:

• definitional thresholds
• reporting delays
• media attention cycles
• hospital privacy
• coroner timelines
• database update policies

The result is a dataset that under‑counts fatalities,
under‑counts injuries,
and erases delayed deaths.

The violence is real.
The reporting is partial.

We Believe You

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