Missing the point. It does "always happen" but it doesn't always happen to the same degree or to the same proportion of the population. The Overton Window can

Missing the point. It does "always happen" but it doesn't always happen to the same degree or to the same proportion of the population. The Overton Window can be enforced to varying degrees and contain different percentages of the population. Contrast the atmosphere during the Cultural Revolution to the atmosphere of a 1990s liberal democracy where the large majority of the population was within the Window.