The basic story: Negativland had to cancel a tour for mundane reasons. But they sent a press release out that claimed they had been asked not to tour by the FBI when it was found that a murdering teen was a fan of theirs.
That wasn't the case, but the media took the bait. Because we all know that music drives people to do heinous acts. Negativland then used the experience to record "Helter Stupid."
So far, there's been no word on what the killer in Virginia listened to. But you know, in trying to explain the unexplainable and insane, the media will latch on to any simplistic, stupid, theory.