Income inequality becomes a political issue when the spread of wealth widens while the quality of life for the majority worsens. If rapid innovation in science and technology benefits the majority then hoi polloi are likely to tolerate the robots that replace them, as well the rich (who invest in the robots) becoming richer.
We humans tend to think of ourselves as special, the culmination of the evolutionary tree. But that hardly seems credible to an astronomer, aware that although our Sun formed 4.5 billion years ago, it is barely in middle age. Should we regret our eventual obsolescence or try to prevent it -- to rage, rage against the dying of the mites, as it were?