https://wtfhappenedin1971.com/
What happened in 1971? The Nixon Shock, which is when the dollar stopped being convertible to gold after it became evident that the US did not have the gold it claimed to have.
The decline of religion also probably plays a role here. You'd have a hard time blaming that on the end of the gold standard.
I mean, sure, economics almost certainly plays a role. But it's not the sole cause.