copyright. They claim that they now have the book contents digitized and therefore are not allowed to redistribute the books (because that would equate to copying in their minds)
a destructive scanning process is mich easier and cheaper (just chop off the spine of a book and feed page by page through a scanner compared to mechanically turning pages)
And destroying? So once they have the data in their control, destroy competing access? Capitalism will be the end of us.
They are destroying it for 2 reasons: