The right would like us to believe that the inequality we see in the United States, and increasingly in other countries, is a natural outcome of market processes. Unfortunately, many on the left seem to largely share this view, with the proviso that they would like the government to alter market outcomes, either with tax and transfer policy, or with interventions like a higher minimum wage.
While redistributive tax and transfer policies are desirable, as is a decent minimum wage, it is an incredible mistake to not recognize that the upward redistribution of the last four decades was brought about by conscious policy, not any sort of natural process of globalization and technology. Not recognizing this fact is an enormous mistake from both the standpoint of policy and politics.