You guys are talking of "wasted potential".
Seriously.
WHAT POTENTIAL WAS THERE TO WASTE?!
Lets be clear, The entirety of the movie is based around a really fucking STUPID idea. It ignores everything from history to sociology to economics. Leaving aside the people who would get killed or wounded in this situation due to violence (no easy task), it would end in billions of dollars of property damage. Manufacturing equipment, power lines, sewage treatment, infrastructure, vehicles, hospitals, schools. Tools used for economic activity and to support human life and comfort, which need to be replaced. As for money, you know what many people who had the money to do so would do to the US if "The Purge" was put into practice? LEAVE. They would buy tickets to Canada, Australia, the UK, the EU, Israel, South Africa, Japan and get citizenship there and take their money with them. Businesses would do the same as well as well. You know why you see "made in china" on so many things nowadays? Well partially it has to do with the Chinese workforce being willing to settle for lower wages. But many places in Africa often has even lower standards of living than China does. Now why don't big multinationals send as much work to Africa as they do to China? Many reasons, among them being education and infrastructure, but also big on that list is the fact that China is fairly stable and orderly and not wracked with constant fighting. If you own a factory, among the things you don't want to have happen is having it trashed by a bunch of machine gun wielding idiots having a fight. I also would not want to have to pay for the heavily armed rent-a-cops. If the purge happened and I owned a factory, I would pack it up and move it to a place were their was still rule of law. The purge would, in no uncertain terms, leave America bankrupt, impoverished and ravaged by violence and no amount of half assed "it's in our nature to be violent so we have to let it out" nonsense will make up for it.
Human civilization did not create laws for yuks. We have them and decided to (at least nominally and when we fail to do so, it is just that, a failure on the end of the executing individuals, not the principle, and negatively effects people) enforce them uniformly because they are useful tools to have. Honestly, you could make a better case that mandating that everyone wears must wear a T-shirt with a picture of a badger on it with violators being thrown in prison on it would decrease crime rate and improve the economy than saying the purge is a good idea.
Now some of you guys are going to say "willing suspension of disbelief", but no that does not stand up. I can buy that a ship could fly Faster than Light. There might be some secret of quantum physics out their that allows us to get around the Einsteinian speed limit in some manner or other. Radio 200 years ago would have sounded like magic as well. It's best if you don't talk about how your space opera's hyperspace works on a highly technical level about it's mechanical operation because they are in the end talking out of their ass. And despite that, it is usually used to serve the purpose of allowing humanity to operate on an interstellar level and is not an active insult to the intelligence of anyone who thinks logically about it for ten seconds.
Zor