We must make our choice. We may have democracy, or we may have wealth concentrated in the hands of a few, but we can't have both. (Justice Louis Brandeis)
The rich have two defining capabilities: independence from and command over others. Those two features make being rich very pleasant indeed. But they are also what make the rich bad for democracy, and indeed even for capitalism. The problems I am concerned with are not about justice. Perhaps it is wrong that some people are rich and others are poor, and perhaps it would be right to redistribute wealth from rich to poor, and from wealthy countries to poorer countries. But from my perspective that resembles debating the proper (re)arrangement of deck chairs. What I'm concerned with is the sinking ship - the threat the rich pose to liberal democracy itself. Democracies are extended moral communities whose flourishing and indeed survival depend on the interdependence and equality of their members. The rich not only have no place in this kind of community, but their very presence undermines it. Therefore, if we believe our democracy is worth preserving, we should offer the rich a choice: give up your money or give up your membership of our society.