The expertly made “The Hurt Locker” is the lowest-grossing best picture Oscar winner on record. For every action film featuring elite warriors, such as “Zero Dark Thirty” ($132 million and a ton of painful controversy) or “Lone Survivor” (more than tripled its budget with nearly $150 million despite its horrific true story), there is a boatload of bombs — “War, Inc.,” “The Messenger,” “Stop-Loss,” “The Green Zone” ($11 million average). Did “Sniper” make Iraq/Afghanistan movies with nuanced messages safe for audiences? Or was its blend of heroics with a thoughtful examination of PTSD in what director Clint Eastwood characterized as an “antiwar” statement mistaken by filmgoers and pundits for a rah-rah recruitment poster? Not that “Good Kill,” the Ethan Hawke movie critical of drone strikes, should be taken as the ideal test of this brave new world, but it’s the most recent U.S.