Because they're literally ten feet below the surface drowning in ideology. We all are. The notion that the Democrats are the solution to an existential threat that is found only in one blustering guy with a bad hairpiece is lunacy, but it's easier to understand than any other alternative-- that the core of the capitalist world system is in crisis again and that as the epicenter we will be in a position of instability until it's fixed. Coupled with the fact that we are probably at the end of our turn as the Great Power of the world, and it's harder and harder to just will ourselves into a fix through hegemonic force applied by 'the right guy.' The reason I said earlier that Biden is the accelerationist candidate is because he's going to govern like a neoliberal, even though the cracks are coming through. Doing austerity to the US won't fix any of this.