The Purge (2013) review

In the year 2022 - which, coincidentally, is when I'm writing this (it's also Halloween!) - the United States government implements a new law that allows everyone to commit any crime (including murder!) for twelve hours; on the night of the event, security systems expert James (Ethan Hawke) plans on keeping his family locked up inside their house, but his dingbat son Charlie (Max Burkholder) lets in an injured man (Edwin Hodge) that several miscreants want to finish off.  The concept itself is fascinating (it's a variation of Shirley Jackson's great short story "The Lottery") and worth thinking about even as the movie shifts to a basic home break-in/survival setup: if we could guarantee 1% unemployment and an extremely low crime rate in exchange for a single day of a living nightmare (in which no one was forced to participate), would it be something to consider implementing?  Is it remotely plausible?  Probably not, but it has spawned multiple sequels which have made DeMonaco a sizeable fortune.