They probably have such a revolving door on their staff at Walmart.
How much can we expect someone hired for minimum wage who likely works in the department for a couple months before quitting/getting moved to another department really know?
If I was looking for a job and got hired to stock the hardware department, I wouldn't offer a protest because I don't know anything about hardware
Given time someone would learn, but I doubt they have that much time there for a variety of reasons.