"we" came off of the gold standard because Nixon was having trouble paying for the Vietnam war. Printing money doesn't create wealth, it redistributes it to the printer: this is seigniorage and it is a tax https://en.wikipedia.org/wiki/Seigniorage
The post-WWII Bretton Woods regimen of “gold standard without domestic convertibility” definitely falls short of meeting the gold standard for gold standards: absent any audit of extant gold reserves, the price of gold (dictated by a purely hypothetical estimation of availability) served as a fixed exchange-rate (and thus implicitly fixed relative real rate of risk-free interest) and not as a true gold standard.
To say that Nixon dictated the end of the Gold Standard is as myopic as to suggest that the surgeon who removes the organs from a brain-dead patient is guilty of murder.
What’s the case for it?