I think they do. It's just, it's so blatantly obvious that "single-payer healthcare is too expensive" and "there's no problem with police violence toward black people in particular" are "luxury beliefs" (in the sense that you can only afford to hold them if you're not directly affected by them) that there's no need to spell it out. (This point is sometimes spelled out when it comes to discussions on race and gender -- that's what "privilege" means. That "privilege" isn't brought up as much when it comes to economic/class issues speaks to the state of class warfare in the US.)