There’s an interesting book on psychology (by a nobel Prize winner) called “Thinking Fast and Slow”, Daniel Khaneman.

It’s called regression to the mean. It seemed that yelling after bad pilots made them good. Kahneman proved that yelling at them when they were good made them bad too. It’s just that great pilots can sometimes be bad, and bad pilots can sometimes be good, it had little to do with how they pushed them.