It is as you put it:
1) Capitalism unsustainable.
2) Will eat planet, then the poor & marginalized, then everyone who is left.
3) People big mad. Rightly so.
4) Rich folk wanna distract; promote fascism, xenophobia and othering.
5) Liberals get elected with help of leftists and promise to change.
6) Liberals no touchy capitalism; instead fascism light.
7) Leftists big mad, no votey.
8) Liberals big mad, because no power without lefties.
9) Capitalists and fascists laugh.
10) Boom.
Like, you cannot make it any easier. People are now just willfully ignoring or debating this. The machine will not refrain from eating them for all their bowing and bootlicking.