The Purge (Blu-ray release 2013-10-8) tells the story of a future America allowing legal murders in one night annually, in order to achieve a low-crime society for the rest of the year.  This idea is as much ridiculous as it is creative.  However, this is the only good thing in the movie, because the entire thing is built on top of repeated stupidity demonstrated by everybody, including the protagonists and the villains.  Whatever messages the movie might want to explore are therefore lost.