PSA:
The Overton window is the range of subjects and arguments politically acceptable to the mainstream population at a given time.[1] It is also known as the window of discourse.
[…]
The political commentator Joshua Treviño has postulated that the six degrees of acceptance of public ideas are roughly:[7]
unthinkable
radical
acceptable
sensible
popular
policy
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https://en.wikipedia.org/wiki/Overton_window