Don’t read on if you haven’t seen it and plan to, because spoilers.Meryl Streep in her role as President of the United States in Don’t Look UpThe just-released film, which stars Leonardo DiCaprio and Jennifer Lawrence as two well-meaning astronomers who discover a “planet-killing” comet headed straight for earth, and Meryl Streep as a Trump-like President who glibly tries to ignore the problem, is currently the most popular movie on Netflix. For good reason, because it’s a rollicking fun satire of American politics, media, tech and celebrity culture.The screenplay, which was cowritten by filmmaker Adam McKay and progressive muckraker David Sirota, suggests that Americans are so polarized by raw partisanship and dumbed down by clickbait and morning TV pablum that they...