More absurdly, they think that this can be derived from a single, or at best, a handful of books that all spew the same basic, underlying ideology.
+1
Not only is it interesting that those books all say the same thing, more interesting is what they don't say. They are completely devoid of so much knowledge about the world, and it's inner workings.
Challenge to libertarians: show me the bibliographies of your favorite libertarian book, and let's see how diverse and complete they are with regard to referencing well respected material on various subject matter.