It may almost seem too obvious to mention, but I don’t think that’s why we so seldom mention it. I don’t mean being male, or being mentally disturbed, or having been cruel to women, or living in places like the United States where it’s easy to acquire weapons of war. These and many other factors are very significant and very often discussed, as they should be, when we consider mass killings.
There’s something else that ties a lot of mass killers together, and it’s also obvious, but