Are you implying these books are so unpopular that a good chunk of their influence and profitability is very much dependent on left-wing public school librarians subsidizing them by making sure they are included in the catalogues?
We should remember that a school library has limited space, so a decision is being made about what to include no matter what.
If you think ideology/doctrine doesn't already play a role in these decisions, I invite you to check if the library of your local high school has a physical copy of say "When Harry Became Sally", "The Bell Curve", or even "The Blank Slate".
In principle, my libertarian side would have agreed with you that imposing these choices in a centralized way is not a good idea. But those principles are only meaningful in a classical liberal context. Not when scourges of affirmative action, indoctrination, ideological subsidies [1] and pseudo-liberal bureaucratic processes are used to impose ludicrous ideas upon us.
[1]: For examples of that, see https://dc.claremont.org/federal-progressive-subsidy-databas...