The leftists are morons who will end up siding with fascists cause they think the breaking of the system means they will win and people will care… Stupid.
Accelerationism is what you're talking about, and its widely rejected on the left for exactly the reasons you bring up. It doesn't work. It only makes things worse for the working class. Even if the revolution does happen, there's no guarantee that what comes out the other side is actually better.
There's a lot of overlap with tankies and accelerationism. They're loud, but they aren't numerous, and also tend to get kicked out of all the other leftist groups.