large scale inequality is the symptom of lack of social mobility. If poor people are able to work hard and become rich, there wouldn't be such large difference in wealth.
Inequality starts from inequality of opportunities.
I think it was Warren Buffet who said something along the lines of: if we handled the Olympics the way we handle wealth, we would be looking for the grandchildren of medal winners in the 50's and 60's and sending them to compete today.