It seems especially bad now. This relativistic mindset is really bad for critical thought: "oh, it was never 100% fair". Well, if it was 80% earlier, it seems approaching 20% now. It's a whole new level.
It's just out of people's recent memories because the bogeyman in the last 25 years became Islamic fundamentalist radicals, not communist ones. And because far left politics fell markedly in size and impact after the collapse of the USSR.