“Excellence, do you buy kosher food in a market that sells treif?”
Actually, I live near an area where there’s a store that claims to be a 100% kosher-only supermarket, but they sell foods that are only kosher by the heterodoxy’s reckoning like gelatin, non-hechshered cheese (i.e. totally treif food). Then there’s a regular supermarket that just happens to have a kosher section. Most of the more religious folks in the area actually prefer the regular supermarket over the falsely labelled kosher market. Point is, the example you gave is more comparable to getting seforim at like a Barnes and Noble or a university library. The OP’s example is analogous to the misleading “kosher” market, which many would consider to be worse.