There are theories about these mass shootings being orchestrated by the liberal cult so they can dance on the graves of the dead and demand gun control. And there is no doubt that those who herd liberal cattle are ruthless and callous enough to do it. My opinion is they are being caused by the liberal cult, but probably not in the way we might think, the real way being far more mundane (though something more direct and more sinister is not impossible).
Every one of them becomes the subject of a massive advertising campaign by liberal media (with even patriot media following along, in order to counter the inevitable liberal propaganda); the killer is turned into a celebrity. These losers finally get to be a big powerful and famous bad guy that everyone hates and fears, like Darth Vader or something, and the bigger the body count the bigger the ad campaign.
This is why they almost always use the kind of weapon being advertised the most, even though there are far more powerful weapons available to them, in the forms of explosives and incendiaries, among other things.
There is nothing new about the copycat concept. We know how well advertising works and so does the liberal press; it's how they make their money. If the small slots of time (what we call commercials) are so effective at affecting behavior that people pay big bucks for them, don't you think the bigger slots of time would be effective too?
Add to this the breakdown of the family given us by the liberal cult, leaving these troubled boys to grow up without a father, the removal of God from our school systems so there is no moral basis, and no fear of being brought to justice in the next life, and the moral relativism that is fundamental to liberal dogma, and you have a formula for this kind of thing.
So yes, these things are being wrought by the hand of the liberal cult. Whether the word "orchestrated" is right, or their hatred of America and God simply blinded them to the effects of their manipulations, the cause of these mass killings is rampant liberalism. These and much more. And now they are trying to build their new political order on the chaos they have created.