Sanders’s and other progressives’ blustering about “morality” is really a smokescreen designed to distract from their vision of a society organized around the threat of government aggression against innocents who simply want to mind their own business.
The modern norm is that economic growth causes measured income inequality to increase. But to have greater income equality and greater economic growth. It simply requires more free market policies and less government interventionism.
Unlike the Versailles peace, which failed horribly, the successful episodes of peacemaking — Westphalia, Vienna, and even the process that ended World War II — had in common extended multi-lateral negotiations and compromise.