Anarchism

For the same reason people fall into fascism. Capitalism is putting the screws to people. Rent is too high, food is too expensive, people are on a treadmill, and dissatisfaction hangs in the air like miasma. People are mad, and they don't know at what. They sense something is rotten, they dont have the words. Fascism co-opts leftist talking points, but pulls a bait and switch with the Jews and migrants and whoever.

Tankies also start from this choking miasma, you look at Tankie propaganda, its compelling. The US commited genocide and war crimes, and is more racist than you know. Capitalists are terrible, yadda yadda you know it. Tankie propaganda also frames politics as a team sport. When you look at the US (or you can look at it as the "Nato Empire," which can be an interesting way to think about it), as the ultimate evil, can be easy to see anyone opposing them as good or worth supporting.