Everytime I see this argument I shake my head at the naivety. People with high net worth are so because they have capital tied up in assets. Nobody is rich because they hoard liquid money.

Say you distribute a rich man's investments in risky instruments to a community living in a remote, impoverished land. Now each investment becomes infinitely less useful because they are not part of a portfolio, it may be difficult to find a buyer for them. Next, how does the community in the remote land trade them, seeing as they live so far from a market?

This is a structural issue of capitalism and not something that anyone can boil down to some greed of the rich. For as long as populations do not see the need to pass laws regulating wealth, capitalist countries will always develop high inequality.