Books that are politcal in nature that appeal to the other parts of the spectrum tend to show up in other sections and don't sell well next to stuff like you're seeing in that endcap display. In my store Marx was filed under philosophy, books on racial justice were found in social studies, and climate change was found closer to nuclear physics than it was Mark Levin's current ragebait cashgrab. So it's not really that rightwingers are better read, it's mostly how the bookselling industry works.

real and I cannot believe there are multiple comments talking about how chain bookstores don't have any leftist literature further left than Bernie Sanders. Penguin Random House will gladly print all three volumes of Capital or Kropotkin's Mutual Aid; both which I've seen and bought before at two different Barnes & Nobles both located in the US South.

OP looking at an end-cap presumably by the registers aside, I think people tend to overlook the fact that most bookstores (even the corporate chain ones) will absolutely take customer requests into consideration; much like how the same exact thing happens with public libraries!