There’s no record of mass murders that fit the characteristics of those we see today happening at any time in history anywhere in the world.
We have this mysterious “deranged” mass murder - a crime that’s never happened in history, suddenly happening frequently.
Here’s an example listing of serial killers:
http://en.wikipedia.org/wiki/List_of_serial_killers_before_1900
Note how they all have some ulterior criminal motive: sex, robbery, cannibalism, family/friend/business dispute, etc.
I’m not talking about tryants mass murdering people, human sacrifices, etc.
And I’m actually not talking about serial killers as shown above.
I’m saying a private citizen - who’s plumb crazy to the point where they can’t hold a steady job - deciding that they hate ___________ (some class of people, humanity, the gubmint, etc.), then proceeding to arm themselves to the teeth, go to the town square in broad daylight - and starting shooting random people.
And they do this so they obviously get caught, probably shot, or they kill themselves. And we find out that they are detached from reality after the fact.
And they were living with other people who supported them.
And they had to do a great deal of planning to arrange the mass murder.
And no one suspected ANYTHING prior to the day of the mass murder.
I find no record of that ever happening in recorded history up until the past few decades.