Perhaps. But it was also still relatively early days for computers, and it was a time of union busting, macroeconomic upheaval, and a shift in dominant politics. There were certainly multiple causal factors at play.

You say that there are things that can only be forced by unions and governments. I agree!

We just need to keep in mind that at least some of the things detrimental to workers that happened 40 to 50 years ago were also forced by lobbyists and governments.