That does not appear to be "random" at all, but orchestrated for an agenda. 
That does not appear to be "random" at all, but orchestrated for an agenda.
That is a VERY interesting graph, but I believe you are drawing the wrong conclusion.
There is just NO way such widespread “orchestration” could be hidden from the public for this long, and continue (what does the graph look like for Pres. Trump, adjusted for the time he’s been in office?), even allowing for the “Deep State” and a complicit media.
Take the shooting @ Marshall Co. in KY, or prior to that, Heath High School (I am somewhat “close” to those), or most others. Upon closer study, most of these individuals were seriously disturbed for a long time. Michael Carneal had contemplated killing classmates possibly as far back as kindergarden (WTH?!).
What I think that graph shows is a type of societal breakdown — a “dam” of self-restraint that has been breached by a combination of many factors: Violence in media, video games, etc., lack of respect for life (as with abortion), Godlessness — and all this comes at susceptible individuals in super-saturated fashion from all angles.
Note that many of those factors make for a LESS controllable population, especially given that there is just no way short of a REAL Nazi or North Korean -type programme complete with violent crackdowns (probably inciting civil war / armed rebellions) that the gov’t can actually do much that will prevent most people intent on mass killings from executing them. Even if the number of privately owned firearms in the country could be reduced by 90% (highly unlikely, IMO), there are just way too many other means to knock off humans en masse — and in this “information age”, how would the gov’t, realistically, stop THAT?
We are much different culturally than Euros, and our society has always depended on enhanced freedom with responsibility. Oh, sure, there were always breakdowns, and horrors (see “The Herrin Massacre”, for example), but most breakdowns had a different sort of background (organized crime, economic conflict, race*, etc.)
*Note that the strikebreakers massacred in Herrin were mostly black, so crime (on both sides, but esp. the union), economics, and race ALL played a part in that one.
NOW we have a more general, deeper, and fundamental breakdown of responsibility and civilization. The dam has not been overtopped, instead, the bottom of the dam has literally disintegrated and slid off its foundation.
If only the problem was as simple and superficial as you postulate... :-(