Because we've collectively been propagandised out of any sense of class consciousness. We don't have class solidarity with our fellow workers. Instead we see ourselves as Jeff Bezos-in-waiting, "temporarily embarrassed millionaires" [1]. We have been manipulated into hyper-individualism and division across pointless lines like race or gender identity as a means of preventing labor solidarity.

Depending on which country you're talking about, leftist momentum has neutered if not outright eviscerated. In the US, the New Deal Democrats dominated Congress for 60 years only to sell their souls to the same neoliberals and corporate overlords as the right-wing.

So now we have rising fascism because there's no counter-balance to capitalism and fascism is, depending on who you listen to, either the political wing of capitalism or it's simply capitalism in crisis.

People from the 1930s and 1940s are still alive yet here we are again. The Red Scare did unimaginable damage to our society.

So this isn't new. It's simply the culmination of a 50+ year long project.

[1]: https://www.goodreads.com/quotes/328134-john-steinbeck-once-...