By the time “Sicario” gets to its final act, and Villeneuve and Deakins approach “Zero Dark Thirty” territory through strikes under the cover of darkness with night vision goggles, it’s impossible to nitpick the screenplay. When life and death are in play, such as in that scene on the freeway, and really the entire final act, “Sicario” rises to the level I hoped it would maintain the entire time. It becomes an entire film of that opening scene—a movie of secrets and the threat of constant violence. It’s about a world that we can’t really even comprehend when it comes to its lack of order and degree of atrocities. And it’s in our backyard.