Sheer silliness. Police forces, prisons, execution chambers, and militaries are also "place[s] where working-class people earn a living." In fact, it's hard to think of any meaningful atrocity, more significant than a serial killer knocking off a dozen or so people, that has occurred over the last century without some working stiff drawing a paycheck from it. I don't mean to categorize higher education alongside mass murder, but if your best defense of it starts with an observation that it's a living, you might as well.
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Well, exactly.
Joanna