I stand continually amazed at how well these are done: the writing, the acting, the high production value. And how logically they extend the storyline from each preceding installment. Everything you fear they might do—from "murder tourism" to literal class warfare/expunging—they do in the latest.
That's the unfortunate part: that something so unsavory is presented so effectively as to appear reasonable to half the fictitious cast.
Hmm. Come to think of it, ignoring the "purge" itself, perhaps what makes the film difficult to watch is that art really does imitate life.
"To our nobler selves be true," lest the occurrence of violence (at rallies, at schools, at airports, in public squares, at the hands of radicals) become prosaic, as it does here.