This is only true when the only source of money in a society is loaned into existence. Even your own bottlecap analogy does not have that flawed characteristic (the current monetary system does have this characteriistic, however).
As Headsonspikes has already pointed out to you, the IBOND does not solve the problem of monetary risk if the issuer doesn't maintain the scarcity integrity of the currency. And, BTW, no one who has ever had the power to issue money out of thin air has EVER maintained such integrity!