Consider high school shootings alone. They've spiked since the NSA started their program in 2005. By your hypothesis, we're not seeing these invisibly stopped s

Consider high school shootings alone. They've spiked since the NSA started their program in 2005. By your hypothesis, we're not seeing these invisibly stopped school shootings, which must be on an order of magnitude higher than what we're seeing to account for the spike since 2005. Either that or the NSA just isn't doing anything to stop these shootings. We may never know.