I can't really see how PAD can be blamed for this. did anyone really think that putting up ten pages of a comic book for free online, accompanied by a panel by panel synopsis, would be a good idea?
Why not? These are the same people who download full-length movies and cds, because they don't feel like paying for them. There are communities in live journal for that, too.
Unfortunately an entire generation of people have come to believe that you have every right to download anything you want from the Internet, whether you own it or not, and seem utterly incapable of understanding why copyright infringement is akin to theft.
Most of these same folks would never, of course, have the cojones to walk into a 7-11 and steal a candy bar, because then they might get caught. But stealing copyrighted material online is just fine, because they know the chances of being caught are extremely low.