It's not a matter of morality, politic leaning or envy. We collectively agree, as a human specy, that fairness, equality and democracy are quality we want to cu

It's not a matter of morality, politic leaning or envy. We collectively agree, as a human specy, that fairness, equality and democracy are quality we want to cultivate. A high difference between rich and poor is a sign of power concentrating, which is the opposite of what you want for democracy. It also means resources are getting less and less evenly distributed. If you aim for more fairness and equality, you need the reversed trend. Eventually, it means exhibit symptoms of being optimized for economic efficiency and a certain part of the population, while we know monoculture is not in favor of the specie on the long run.