> Laws that bar any other shipping service from delivering mail and packages directly to residential and business mailboxes. Shapiro estimates that this gives the Post Office a $14 billion annual boost...

I believe you may wish to re-read your own link. What he said is correct. What you stated is patently incorrect.

The above quote is from your own article and states that is a 3rd party estimation and not-at-all a tax donation that the American populace pays for, which is what you also stated.