Google is testing algorithmic changes for scraper sites, especially Blog scrapers with a new concept called "Report scraper pages to Google" maybe the next version of "Panda". Looks like Google may FINALLY be getting a clue that scraper sites have become a problem. I'm sure the new algorithm punishes the wrong people like Panda did.
Google wants its users to get the best search results possible. For this it is regularly updating its search algo so that all the crappy sites don't get the traffic which will ultimately lead the users to use other SE. I don't think there is anything wrong with that.
Sites are done not only by many ways but with so many good or bad concepts behind it, Google can't make perfect algorithm to separate those bad and good minds.