There's some investment debate but ethically, there's no debate.

It's simply not "right" to tie the value of everything in society to the value of a specific good. Gold, like all other goods should be free to have a value that is intrinsic to its uses (of which there are many in science and engineering) and other goods should not be subject to price fluctuations due to supply and demand issues related to gold.

Obviously, people have issues with their fiat currency issuer – especially since currencies tend to be a government monopoly and lots of governments abuse that monopoly. However, that's well outside the point I was making. In any case, that's not an issue with fiat currency per se but with government monopolies on fiat currency (something that currencies like Bitcoin have set out to address).

Debate can't really be had. Fiat currencies are better and more predictable... right up until they aren't. Which takes so long that hard-earned experience has long since diffused.