Why do people who say they love the constitution have no problem with fiat money?

Section 10. No state shall enter into any treaty, alliance, or confederation; grant letters of marque and reprisal; coin money; emit bills of credit; make anything but gold and silver coin a tender in payment of debts; pass any bill of attainder, ex post facto law, or law impairing the obligation of contracts, or grant any title of nobility.

http://www.law.cornell.edu/constitution/constitution.articlei.html

States cannot use paper money to pay off debt or emit bills of credit.  Therefore their current transactions are all illegal.  Our nations money was meant to based off of gold, silver, and copper.  It wasn't mean to be this inflationary.  Our founding fathers saw the problem with perpetual debt.  Every state uses paper money now to pay off their debt as opposed to using metal currencies.  Their whole operations are illegitimate.  

The coinage act of 1792- which is still authorized- permits only gold, silver and copper to be used as money.  Nothing else can be used in financial transactions (http://www.constitution.org/uslaw/coinage1792.txt).  So the actions of the fed are illegitimate.  So not only is the system of money that states are using is illegal... but also we're not supposed to have paper money based on nothing as our national currency anyways.  It's unconstitutional and illegal.

I don't see why people who claim to love the constitution can be okay with fiat currency and what's going on today.  The nation was meant to have gold and silver as its national currency.  So... I don't know how the whole constitutional argument got overlooked.