This is a quality quote about the sniper, from Jesse Walker at Reason:
My own baseless theory is that the murders were committed by a mad postmodernist. The sniper certainly seems more self-aware than earlier serial killers, and it has been widely suggested that he or she delights in undermining the police theory of the moment with each new target. If you want to foster suspicion of master narratives, you could do no better job than the killer has; he seems eager to do to criminologists what Burroughs and Pynchon did to literary critics.