Comment by travisb

If the left-most edge of the Overton Window had been pushed right of the centrist position of, say, the 90s that would be correct. But it's obvious that isn't at all true -- many moderate left positions today would have been considered outlandishly radical in the 90s.

It's rather more likely that the increase of left-authoritarianism is due to increasing resistance to moving the Overton Window, both the left-most edge and the right-most edge, leftwards. As resistance increases more forceful techniques are necessary.