I was talking from a theoretic point of view. In standard economic theory an outcome is considered good if it makes all participants better off. Economists consider that people can agree on this.

Economists don't even try to answer the question of which distribution of wealth is fair. That's why mainstream economic theory does not concern itself with this question. All the economists say is that everybody should be richer if markets work well, they have no opinion about how rich the rich should be.

However the distribution of wealth is a very relevant question to a great number of people. If a majority thinks the outcome of the market is not satisfactory, they can correct it with politics.