I’m inclined to think, given the number of incident-free flights every year, that two incredibly outlier episodes is not a trend, it’s statistical noise. There will always be an unstable person on board some flight, somewhere, sometime, but the odds of them causing a crash are still vanishingly small. There is no test for “fitness to fly” that can be administered at the gate, so vigilance and quick crew reactions are the fail-safe. I’d hate to see the FAA mandate a cargo-net barrier behind Cessna 402 cockpits as a result of this incident. 'Cause you know if they’re going to require it for them, they won’t be able to justify not mandating it for C172s… 
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