Organized crime isn’t all spaghetti and pole dancers. “Killing Them Softly” (2012) takes a look at the darker side (addiction, revenge, murder), sometimes in vivid, slow-motion sequences that are either grotesquely tedious or stylishly, um, stylish. Apparently, there’s some kind of metaphor going on, too. It has something to do with the Wall Street meltdown and the 2008 presidential election. Brad Pitt explains it all at the end. The fact that he has to explain it all is not a ringing endorsement of the movie’s first 96 minutes. But if you’re in the mood for a mob flick, it’ll do.