As an employer, getting rid of your worst 1% of workers once a year is just housekeeping.
In most cases the employee wasn’t a bad person, they just weren’t able to satisfactorily do their job and weren’t willing to accept reassignment to a job we felt they could do.
Fairy dust is more real than that.
The former is your fault as the employee, the latter is due to larger business conditions and generally recognized as no immediate fault of your own. In real world terms, you can be personally fired for not doing your job and can be laid off because the company can't afford to keep your plant/office/division running due to outside conditions.
https://en.m.wikipedia.org/wiki/Worker_Adjustment_and_Retrai...
https://en.wikipedia.org/wiki/Worker_Adjustment_and_Retraini...
California also has their own version: https://www.shrm.org/resourcesandtools/tools-and-samples/hr-...
http://www.edd.ca.gov/Jobs_and_Training/Layoff_Services_WARN...
https://en.m.wikipedia.org/wiki/Worker_Adjustment_and_Retrai...
Model 3 production rates were missed by a wide margin, so at least a few people should have known that management would react.