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They are not mutually exclusive.
They are when your labor pool is unskilled, and you are in competition with other places which also try to deliver rock-bottom prices on stuff. I notice none of these hit-pieces mention Target or the other similar stores.
People can start at WalMart, learn valuable job skills (you would be amazed at how many people need to learn that showing up for work, on time and sober, is a requirement for advancement), and then use that work experience to qualify for a higher-paying job elsewhere.