David Wallace-Wells Guest ColumnistFor Variety‘s Writers on Writers, David Wallace-Wells pens a tribute to “Don’t Look Up” (screenplay Adam McKay).Parables are hard, which is why the best ones tend not to play like parables at all. Light comedy about the end of the world isn’t exactly easy, either, but “Don’t Look Up” delivers that, too.In retrospect, at least, we now know Adam McKay’s early movies were about much more than they seemed to be about at first.