Insofar as there is blame for Thatcherism, that falls primarily on the people who voted for her, and the people who disagreed with her, but colluded with her for reasons of real-politik.

Including especially those who obstructed the kind of tactical voting and electoral reform which would have made it impossible for a minority backed extremism to rule the roost for so long.

Concentrating the hate on Thatcher is a bit like saying it's the fault of the cigarettes when you get lung-cancer, and ignoring the fact that it's only when you smoke them that they do you any harm.