Google picks through the public domain, accumulates that data and then deems it private property, theirs. Typical liberal mindset.
This is neither a liberal nor a conservative pursuit. You too, whatever your political persuasion is, can feel free to compile commonly available data from any source and make an independent database from it (i.e. your own library).
Fair use laws determine what portion of that database you may share with others at one time.
Apparently you don't understand what public domain is.