Not sure, but it only seems like it became a widespread argument in the last decade, maybe two.
My guess is that this argument wasn’t made that often in the recent past - because most pro-capitalist would have believed that government bureaucracy and welfare reforms to a degree were “normal capitalism”. They would have just said “love it or leave it” before and pointed to how crappy X communist country was.
But in the 90s, the entire mainstream claimed that the market was more or less infallible—so when failures are apparent, obviously it must be due to a false church of capitalism. Libertarian cultists, conservatives, and liberals all say that market forces work best. Either they have some sort of class-based ideological bias and lie to us in those interests... or some people or moral failing of people must be always mucking up a perfectly working biologically ingrained perfect system. Lol.
The dark-side is that libertarians in an age of recession apparently start radicalizing and blaming a whole group of people as being lazy (blacks, immigrants etc) or plotting to corrupt the system (the Jews... “cultural marxism” and for some reason usually the Jews again).



; basically their argument there is confined to “muh that's not real capitalism, that's crony capitalism/corporativism/cronyism” or whatever they call it, it's essentially a repetition of the same argument.
