Libraries have copiers for the expressed purpose of COPYING pages of books and magazines. Many smaller libraries never purchase CD's, computer games, or movies at all. They are donated by private parties, and as such the library doesn't even have the "right" to the media period. Blockbuster pays fees to the copyright holder for "X" amount of rentals per video. The library has no such arrangement with ANY copyright holder.
Xeroxing an entire book and giving it away may indeed be infringement, but unless monitory damages can be proven there is no case.
You are dead wrong on the radio subject. The radio station (supposedly) paid ASCAP fees for each time the song is played. I assure you very often these fees are NEVER paid and frequently UNDERPAID. The station does not pay for a million listeners recording the song.
And you certainly CANNOT "record anything floating around in the air". Try sitting at the NSA's gate and recording "what floats around".
If you think that people don't swap files quid pro quo you might buy a useless bridge from a person who doesn't own one. That's the point. Some people will believe anything or can convince themselves of anything.
They are donated by private parties,
The gift transfers ownership.
Copying small amounts of books is fair use. Brush up.