Liberal vs. Conservative Morality
Aretae says …
Jon Haidt, one of my favorite psychologists (not least because he demolishes Kohlberg’s silly moral stages), has a perhaps more complete answer. He suggests that the liberal/progressive side of the fence politically operates off of only 2 moral dimensions (harm/care, and fairness/reciprocity), while the conservative ethics usually operates off all 5 human moral dimensions (including also: Ingroup/Loyalty, Authority/Respect, and Purity/Sanctity).
Libertarians are weird, so we don’t count.
I think this account does a good job of explaining why liberals differ from conservatives on the importance of income equality. From conservative POV, Bill Gates deserves his money from a respect/authority position.
From a liberal POV, fairness trumps that, and suggests that while Bill may deserve some reward, but the scope of his reward is way out of line, regardless what he did.