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Rational choice individualism does _not_ take "selfishness" as a premise. That is an addition from petty-bourgeois moralism.
The Declaration of Independence makes the "Pursuit of Happiness" -- i.e. wealth -- a basic human right, following from the premise that all men [sic] are created equal.
And incidentally, "oil capitalists" does not name anything, since the oil corporations are owned mostly by banks, asset management corporations, "food capitalists," pension funds, etc. There is no way to identify a distinct group of humans who can be labeled "oil capitalists."
Marx never got around (and Marx knew this) to an analysis of corporate wealth.
Carrol