So, while the first Purge film sucked, and the second one was a remarkable improvement, and actually explored how this would affect society a bit, even though this is still a stupid premise. There was also the revelation at the end that:
Spoiler
So, they seem to be running with this, and showing a bit of the political side of this new government, and how its all to keep the poor killing each other, and keep their weapons aimed away from them. Also, the Purge is to get rid of those who are politically dangerous to those who are in charge. Is it still stupid? You bet. But I will probably give it at least one watch, because I enjoy allegory.