Do mass murderers need large-cap mags?
Bogota, 1986: Campo Elias Delgado kills 30 people, using a knife and a .32 revolver. In most mass slayings, police response time is 10-20 minutes, meaning that the killer doesn't need a large magazine, or as in this case, a magazine at all.
Howard Nemerov compares a mass murder that didn't happen in San Antonio. The shooter was shot down by an off-duty officer after he wounded two people.