I'd want to read and research more, Amos, to place much wieght on my own opinion her, but I am thinking Athen's research and observations may well explain the violence of, say, a gang member, (we have all read or seen documentaries about the extremely violent initiation rites that include exteme violence perpetrated on the initiate and the requirement that the initiate commit extreme violence or murder on another.) However, I don't think it is an explanation for mass shootings by one or two individuals such as at Columbine or Virginia Tech, et.al.