Theorizing about mass shootings is difficult because many cases appear to be aberrations of violence that arise in random areas across a given country. Along with other rare events such as nuclear accidents, aircraft hijackings, genocide, and mass suicides, mass shootings fall into the spectrum of phenomena that are highly important in their historical impact on societies, but also are rare, infrequent, and difficult to study. In an inquiry of American mass murders in which four or more victims were killed in a 24-hour period, Duwe (2004) discovered that since 1976, there were an average of 28 mass murders per year. This contrasts to the average 14,000 homicides that occurred each year throughout the noted time period. Since mass murder is such a rare phenomenon in comparison to "regular" murder (only 0.2% of all homicide incidents in Duwe's data are mass murder incidents), this form of homicide has to be placed into the rare event category. In the US context, there were 125 mass shootings that arose from 1976 to 2013. From my own inquiry into US cases (Anisin, 2022), I identified 213 attempted and completed mass shootings. In Chapter 5 of this book, data on 76 attempted and completed mass shootings will be revealed and even though these cases are not related to the total homicide frequencies from each country in