for right wingers these books are almost entirely for show and seldom read. having them is less about extracting knowledge from them but about the status symbol of having a trump or liz cheney or ted cruz book or showing off your opinions with these visual capsules of ideology. there isn’t anything in that book worth reading and they know that, it’s just about sending money to your favorite right wing grifter and then getting a little display piece out of it.
also the big chain bookstores are only shelving these books because they’re acceptable opinions in this fascist society. if they shelved lenin for instance i’m sure they’d get blasted by chud media for a week. many smaller independent bookstores will often have marxist stuff or, at the very least, some relatively left leaning authors.