This is an interesting idea, however, they aren't working with the idea. It's just a home invasion movie. These can be very good (the strangers, funny games etc.) the trailer was alright, but the tv spots are absolutely terrible, and the idea of this film should be made into something else instead of a cheesy looking horror film. Here's an idea. Why not follow a man who has never been out on this "purge" but goes out to get revenge on a man in the streets, and then realizes the true horror of the purge, and a film that answers the question "how and why would this work?" That would be a good idea, which would work with the idea. Based on the trailer, it could be a good movie, but why not use this idea for something else? I really hope the family leaves their house and goes into the city so you get a glimpse of what this "purge" really is, because it's really not a good horror idea, it's a better action, thriller, or even comedy idea.