Fiat currency has the intrinsic value of the nation that created it and how well they have managed it.
Zimbabwe has little value and on top of that the nation has mismanaged it’s currency.
The US has tremendous value in everything from government owned land, assets, society, business, etc.
Have elected officials done their best to screw that up? Heck yeah. But there’s a whole lot more value than used electricity held in virtual vaults only accessible via the internet.