It's probably the "performance optimization" and such described below having an effect. This stuff happens in a lot of the traditional types of companies that are labor and equipment heavy. The new bosses in middle gotta push productivity up, costs down. They might mandate performance standards or with the time optimization allocate the "right" amount of hours for each job. The workers might get fired for not meeting specific numbers.
They probably don't have many better options either given they were doing deliveries for UPS and FedEx. The employees responding to that environment will either accidentally or intentionally in spite do stuff like that. I've seen quite a few of those companies. You also get to experience more spite the less the company or customers care about them. The jobs that require slaving away for nothing under assholes are the most consistent in generating that effect.
https://harpers.org/archive/2015/03/the-spy-who-fired-me/?si...
They probably don't have many better options either given they were doing deliveries for UPS and FedEx. The employees responding to that environment will either accidentally or intentionally in spite do stuff like that. I've seen quite a few of those companies. You also get to experience more spite the less the company or customers care about them. The jobs that require slaving away for nothing under assholes are the most consistent in generating that effect.