I'd say that business schools have been for the past few decades teaching that management has to be outright militantly hostile towards any employee, going through great lengths to work them to death and drop them at the drop of a hat.
Thus, these people have been leading by example on how everything and everyone is replaceable, even creating and validating the temp agency industry as a legitimate employer, and once the lessons on how everyone and everything is replaceable are applied by employees towards employers... We have a crisis?