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Maybe I can come up with a stronger/more defensible argument: creating a just and equitable society is valuable on multiple levels including moral and economic.
Societies without "lower classes" are good for a variety of reasons.
Researching into why we have lower classes and, hopefully fixing that, is a good thing for a bunch of reasons.
Something something how many potential new einsteins aren't pushing boundaries because they had to drop out of highschool and work 3 jobs?