Any powerful idea, or book containing powerful ideas can be twisted and corrupted to be harmful. On that basis they missed a few classics, in no partcular order:

The Bible, The Torah, The Koran.

Is it just me, or does it seem as if virtually all of the books on that list challenge som important aspect of life regulated by the above books, and more importantly, their interpreters, the preists?

BTW ,Metchosinm, 'The second sex' was in the honourable mentions.