Hm... I'd think that plays a role too.
You know, if somebody engages into his job too effectively, if he gains too much power and influence among the other employees, especially if he brings forth new ideas and shows signs of resistance if new things come up that result in less advantageous circumstances for the workers in a facility, then, from the side of the employers, they're quickly with getting rid of that worker that could possibly stir up a revolt. If they cannot make it by simply firing him, because of employees' rights or such, then they take out that methods - the psychological mace. Wearing somebody out. This you can achieve by several methods, like playing around with the shift schedule, urging you to react to quick changes in it immediately, always giving you extra work, cutting down your working hours, relocating you to a different activity, if all that does not help to make you leave yourself, the last resort is putting something into your things which actually belongs to the facility - forcefully making you a thief. And thiefs can be fired immediately.