One of the things that I find most interesting about the economic policy rhetoric that you hear coming out of the Occupy movement (and out of the White House for that matter) is the notion that a rich person's earnings must be taxed in order to be redistributed. To hear them tell it, a rich person's wealth sits in cash under a mattress...unless Washington taxes it away.
You can make an argument for low taxation based on moral principle (a rich person deserves to enjoy the benefits of their hard work) and that argument is convincing, but it does not explain why low taxation stimulates economic growth. For the latter point, one needs to understand that capitalism is a redistributive system. And low taxation stimulates economic growth because capitalism is a better redistributive system than any system government could devise.
A rich person's untaxed wealth does not sit in cash under a mattress, it sits in bank accounts, in investments, and in venture capital funds. It sits on the balance sheets of start ups, providing them the capital they need to develop new products and services. It is the nature of capitalism that a rich person's wealth is spent, not by the rich person itself, but by the economic agent that expects the highest return on that spending. When government redistributes money, there is no mechanism that encourages that money to be spent productively. In the private economy, wealth is redistributed with the intent of earning a return. Spending that earns a return is productive spending.
It is striking that so many political commentators, so many government officials, and so many young, educated, occupy protestors (my peers) don't understand this basic principle of capitalism. Untaxed wealth becomes available to the rest of the society. The spoils of the 1% are spent every day by new businesses, home buyers, non-profits, and charitable organizations. When we redistribute money through government, rather than the capitalist system, that's when it tends to disappear.