That has not ever been the reason governments removed commodity money. The reason always boils down to, "I don't have enough money, I'll just change the rules to benefit me". Fiat money is and always has been fraudulent. Whether it is to pay for a war or a personal agenda with government power the reason doesn't matter. What matters is that the people in power change the rules to benefit them to the detriment of the populous. Commodity money puts the people and the government on equal footing. The greed of both is constrained by physical limits of commodity supply. With commodity money, to have more you need to earn more. With fiat money only the people have to play by that rule. The government is not such constrained. This leads to an ever increasing money supply to pay for government largesse that diminishes the value of the labor of the populous. With commodity money it would not be possible for government to overspend tax revenue for 9 decades. No private bank would continue to lend to such a prolific debtor.