No shit, next you're going to tell me water is wet. If you're the sort of person that cannot decode what a "Performance Improvement Plan" means then you're going to be eaten by the industry alive. It's insane to me that we even need qualified people to reassure anyone about that.
Many people take their relationships with their employer in good faith. To discard these people as obviously unfit would be a massive loss to any industry.
There are real pips, but you have to know when to hold them and when to fold them.