The new film “The Hobbit: An Unexpected Journey” (opening Dec. 14) has got action and adventure galore, just like “The Lord of the Rings” trilogy that preceded it. But the director and actors who worked on the movie are well aware of the deeper themes that lie at the heart of the work of J.R.R. Tolkien (1892-1973), who authored all the original books, published between 1937 and 1955. At a recent press conference about the film in New York City, Richard Armitage, who portrays the Dwarf warrior Thorin Oakenshield, said, “One of the things I find when I look...