Your "concern" is noted - and discarded.
It is entirely possible to orchestrate mass shootings by encouraging unstable individuals within a large community. Our "News Media" regularly provide such encouragement by publicizing the biographies of the killers. That inspires "wannabees".
Our doctors regularly prescribe psychotropic medications with unstable side effects to teen-aged boys. Dosage errors or withdrawal from these medicines creates violent and suicidal tendencies.
It does not take much of a push at all for somebody to go berserker. It will happen "spontaneously" if conditions are properly arranged. When there are a large enough number of candidates, one of them will always light up at the desired time.
You do not always know which one that will be, and you don't always need direct contact. You just seed the grounds and reap the harvest.
#92 = well stated.