Why does it have to be 70 years? Can we do 10 20 30? Then I don't believe the overtone window is that obvious 30-40 years ago you were considered bad if you bought a right wing newspaper, people would stop talking to you. (Well at least where I am from)
Coincidentally that is the period where workers had the most rights, which has slowly become worse with time in every western country.
At that time they thought right wing people where against them having rights and quiet evil, they had been thought by their parents, who worked hard for those rights. Our generation has not learned the importance and given more room for the right wing to control our media, which then controls the narrative. Why is there so many articles about trump or Elon musk, I mean we have two idiots who cares, do we have to know that trump misspelled coffee?