Tax revenue from the rich gets re-distributed to run government services and help feed and educate citizens in a Capitalist democracy. 30% of a nation's annual income is needed just to run America efficiently. 

We could reform America's tax system to a Libertarian Tea Party wet dream as follows:

The government should allow anyone who earns over $500,000 to pay no tax. Decreasing tax rates on people earning below $500,000. Higher percentage taxes on lowest incomes. 

Reduce corporate tax rates to 10%. Just see what happens. Ban all Unions and remove minimum wage laws.

Hosni Mubarak the former Egyptian dictator worked hard and honestly earned his $50 billion fortune. Everyone is rich has worked hard and earned their fortune. Why should the rich pay taxes to feed the poor?