- Nazi death camps
- Stalin: Ukraine and Siberia
- Pol Pot
- Hutus and Tutsis
- British vs. Irish (Potato Famine)
- mall shootings in Oregon
- murders in the Colorado theater
- Virgina Tech
- Red Lake Senior High School
- Norway: Anders Behring Breivik
- Amish school killings
- Oikos University
- cult suicide/murders
- "Deadliest School Massacre in U.S. History." Michigan, 1927, 38 murdered.
- Beslan school hostage crisis. Three days, 380 murders.
We don't know how many murders have been prevented by good health care, good drugs, concerned friends, law enforcement intervention, God's grace. "By definition we can never know a counterfactual with certainty."