I wrote a blank check and threw it at my computer, but it didn't work. And here is an interview with Levine about the DLC.
I don't see why. The warning at the beginning of the video shows that it is for a mature rated game, and there is nothing inappropriate in the video (that I saw).
The newest episode of Giant Bomb's Interview Dumptruck features interviews with Ken Levine and Forrest Dowling. http://www.giantbomb.com/podcasts/irrational-games-ken-levine-and-forrest-dowling-ta/1600-541/