Normally the Overton Window defines a range of discourse between left and right that is considered acceptable. When things get so extreme, however, that we start experiencing the Horseshoe effect, the Overton Window functions differently. Suddenly the Overton Window defines completely disconnected extreme forms of discourse, and the radical disconnect becomes normal whichever socially acceptable extreme you embrace. Liberalism moves outside of the frame, and is viewed on both sides as stupid cooperation with the other extreme. On the contrary: the extremes are in stupid cooperation with one another, serving as justification of extremism.