An insane belief is one that is so blatantly false that even pointing out scientifically proven reality won’t change it. The generalized opposition to abortion is an excellent example of a common insane belief. Like most the common insane beliefs, it is usually a reflection of a religious or another philosophical school of thought.
Paul Fitzgerald and Elizabeth Gould explore the mystical vortex of Newgrange
The “white identity” ideology that is being embraced by people like Kevin MacDonald and Jared Taylor is historically unsustainable and incoherent.