That's just objectively wrong, poor folks who support the capitalist system don't believe that they'll be rich enough to start exploiting some day, they believe that the hierarchy which capitalism establishes is a necessary one which society would collapse without.

They believe this so fervently that they immediately dismiss notions of abolishing or significantly reforming the structure of capitalism as a ploy by some shadowy cabal, or sometimes just the Jews, to replace the existing hierarchy with a new one that will be just as bad if not even more corrupt and incompetent at getting what is needed to whoever needs it and in the quantities they need it in.

Atlas Shrugged is literally Ayn Rand having a hundreds of pages long moral panic attack over this exact fear because she believed it's what happened to her pharmacologist father with the rise of the Soviet Union, sporadically broken apart by her inability to write for so long without her veering into writing about her CNC kink.

Of course it's pretty telling that even Ayn Rand acknowledges that this supposed incompetence stems mostly from rich assholes sabotaging the infrastructure they use in a baby mad temper tantrum about not getting to leach off it anymore because whatever vital national industry was being nationalized.

Of course there's also the high degree of mistrust in the state in the US which aids these perceptions of the capitalist hierarchy as a necessary thing, because now it's seen as a parallel structure you can opt into in defiance of state provided services, consider how much the right gets a hard-on over establishing privatized alternatives to education, or public transporting, even medicare has section C and D for private options for care and medicine, also C and D are where all those reports of medicare fraud the right raise moral panic about tend to come from.