In a hierarchical society, class separates groups of people just as rigidly as time and space, and is every bit as useful a buffer as the other two forces.
Until it isn't.
Eventually - once you've banned abortion, once you've taken all the "controversial" books out of the library, once you've made affirmative action illegal - you reach the layer of non-negotiable culture war demands that the rich *can't* buy their way out of.
Like immigration.
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