Let's take this a step at a time.
Taxes are paid by to provide services.
ALL Should Pay taxes, because we ALL use these services -
Police, fire department, education, medicare, social security, schools, libraries, roads,
Medicare is just ONE OF THE SERVICES (Benefits) we get for the money we pay in.
I will expand this in a Google Doc & Spreadsheet -
take a look = http://docs.google.com/Doc?id=dgwzbkk9_230cfw5r4