Of course I've received a package from the bankrupt and insolvent USPS and yes I also buy food from grocery stores that receive food over roads badly in need of repair.

I didn't say that the government does not do or provide ANY good things. However that does not mean that paying taxes to a government that IS inefficient and bloated can or should be called the "common good". The same government spent over a trillion dollars on wars in Iraq and Afghanistan. Are those wars part of the common good? The same government spends half a trillion on welfare of various sorts. Is that welfare part of the common good? The same government got us almost 15 trillion dollars in debt. Is that debt part of the common good?

Different people may say yes to one, two, or all of the three things above. I, however, would say no to all of them. To me, paying taxes to the government is most definitely NOT the common good.