Visit “WTF Happened in 1971” [1]. That argument doesn’t hold water for middle and lower class persons.
Interestingly enough those policies where grounded in the same ideological background as today's crypto enthusiasm: Austrian economics.
In the 70's, Keynesian's political influence died (because of inflation haters), and so died the golden age of America, and the lower-income families spiralled to straight poverty. Now, after the 2008 crisis, Keynesianism is in charge again, and some people are really bullish with crypto for ideological reasons (because they've drank too much of the 80-90's propaganda comparing Keynesianism with Communism, really). But using lower and middle class persons as an argument reveals either poor historical knowledge or bad faith. It's pretty ironic anyway.