There are no rational arguments or pathos appeals to assuage the greed and lust for power by the rich. They're too far gone and immovable, especially when they have the personality defects similar to malignant narcissism. They only respect strength.
What do you think is the causative factor? Is it that the greedy and narcissistic are able to amass wealth or that wealth often changes you to be more greedy and narcissistic?