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After a few decades of living in this world, you develop a sixth sense for sensing patterns, blatant bullshit and probability (especially if you happen to have a brain that was geared towards these things to begin with).
These frequent killings of groups of random innocent people simply aren't possible.
People in the U.S. -- if they're actually going to arrive at a point where they're willing to kill a group of people -- are many thousand times more likely to kill a group of people that they feel engaged in injustice against them or people they know or care about.
If these random mass killings were legitimate, there would simultaneously be many thousand times more killings & bombings of politicians, CEO's, bosses in meetings, malpractice doctors, churches involved in molestation, police departments, etc.
Killings of random people in schools, movie theatres, restaurants & such would be virtually non-existent in comparison.

But if the CIA were staging events to scare people into believing that they're not safe anywhere, and that police state expansion and support of military invasions is needed to keep them safe, well, then what we're currently seeing is exactly what you'd expect to see.