but the claim wasn't that is was a "a conservative library" (consisting or specialising in having of a large amount of conservative titles, presumably for conservatives) - but that it (or a large selection of its titles) caters to RW culture warriors, to the extent that you ask "why would they have published this one if it was not?", i.e. it cannot be merely conservative, but assumed RW-extreme.

Of course the term “right wing culture warrior” is questionable, but when your library is so right leaning that its political orientation is obvious after just glancing at a handful of books cover then maybe this term is kind of apt.