Well, I would say at least since the 80s, where the political movements started in the 68 lost steam and we entered a period of political irrelevance for the Left throughout the West. After the fall of the USSR, it got worse because especially in Europe the Left lost the leverage given by the threat of a soviet invasion/support. The G8 protests in Seattle and Genova kinda sealed the deal, showing that the future has been abolished.

It shouldn’t, but it does. Now what?

same author, more accessible stuff: https://networkcultures.org/longform/2025/03/18/seven-mantras-for-political-holism/