They Wasted a Perfectly Good Plot: The general consensus is that an intriguing concept (all crime is legal for twelve hours as a way to create social order) is barely explored, and the plot is a basic Home Invasion thriller with The Purge being just an excuse as to why the family can't call the cops. You get some glimpses into the Purge at large through very brief news reports. For example as many as 200 people are reported to have engaged in a mass free-for-all purging in their town centre.
Are hackers and black marketers doing all their work during the purge? Do small tier retail stores no longer exist because only big retailers can afford the private armies necessary to keep their inventory safe? Would this not be the perfect moment for a foreign army or a terrorist cell to attack the United States? Is Las Vegas taking odds on everything? Are scientists getting together to conduct all of the banned research they can in the twelve hours? And yet amidst all these questions it opens up for exploration, the film only chooses to focus on one: What happens... When an army of masked psychopaths attacks your home.