In one of Heinlein’s books, Methuselah’s Children, he briefly mentioned “the crazy years” (see also here and here for more on the topic) which lead to a breakdown of society. He wrote it in 1958 and was referring to a time of approximately the early 1970s. While the 1960s could be viewed as crazy in a lot of respects they can’t hold a candle to what we are going through now.
Via email from Rolf:
People who believe two contradictory things at the same time have serious mental problems. They are crazy.