I honestly liked the Purge when it focused on the disparity and how the purge was a means to cull and destroy the stratified working classes by way of creating infighting to preserve the power of the truly rich and powerful (who suffered little form the Purge), as well as showing suburbanite derangement (the first Purge movie). Wisecrack has a great breakdown of the Purge as a means of talking about income inequality and the ways in which America kills the poor.