One of the year’s most controversial films is, in my opinion, also its best. I suppose any movie about the hunt for and killing of Osama bin Laden is going to be provocative, but “Zero Dark Thirty” has proven especially so. Writer/director Kathryn Bigelow and co-writer Mark Boal researched this film by interviewing CIA operatives, members of Seal Team Six — the unit that ultimately killed bin Laden — and others with knowledge of classified information.