Department manager seemed to hired least 1 or 2 lazy people to work in the department. In lieu to make up the loss of productivity, department manager will assign 1 employee as the scapegoat also managed to influenced tons of employees to begin pushing the assigned scapegoat.
That's why you never want to learn how to do anything beyond the scope of your job. Because, if they know you know how to do something, they'll expect you to do it all the time. I'm the cake decorator at my store, but I also know how to bake bread. The managers don't know that, and they're not going to know it either. If the baker calls in, we just won't have bread that day.
Also, when they ask you to train a new hire, only train them with the bare basics to get the job done. NEVER train them with everything you know. EVER. The reason is, you may very well be training your replacement.
This is why I only train new hires bare basics to get the job done.