Just as a side note it's always made me extremely sad when we demonize the shooters and terrorists. Of course what they did is terrible. But we should have sympathy with them because they are sick. Love is cheap if it only matters on Hallmark cards and corporate holidays.
I think the meme that 'all murderers are sick' has been thoroughly debunked? Real ordinary people can decide to do horrific things if they get in the wrong state of mind.
I think the difference is that mass murderers kill people just to kill people. While other 'traditional' murderers kill for more material reasons (money, drugs, etc.)
"Traditional" murders were are not necessarily for material reasons.
"Introduction: Theory of the Culture of Honor is one of the few models in criminology specifically geared toward homicide. It proposes that, in certain societies, men must never show weakness and are required to react violently to any perceived threats to their reputation, thereby increasing their probability of committing a homicide. This has been suggested as the main explanation for the high rates of this type of crime in Brazil, particularly in the Northeast. Underlying this explanation there are complex mechanisms and processes that have yet to be clarified."
