And, I do not condone anyone hiding liberal books. I am actually in favor of exposing liberalism to the greatest extent possible.
Per Rush, one day we will need the documentation, so after they are gone we can always have examples of what they were like.
Mebbe it's just me, though. I've never had any problem getting a conservative book in any bookstore, even if they had to order it for me. I've never tried in any really lefty areas, luckily.