Book Piracy: Why Does it Happen and What Can We Do to Stop It? #MPBooks

Last week a new website became a hot topic on Twitter.  The website offers free downloads of digital books, many of them by some very well known authors, but it does this without the permission of those authors or their publishers.  The website is offering pirated copies of books, and many are willing to take them, but is there anything that can be done to stop this piracy, and can the reasons people give for distributing or taking pirated books ever be justified?