>> probably these are the same type of people who say we shouldn't be writing about or studying aids because it's a deadly topic. we have an opportunity for a guy like mark chapman who has agreed to open himself up for exploration and study to hopefully prevent other mark david chapmans from coming along. people who criticize journalists for exploring people like that i think disappoint. >> it gives him publicity for this horrendous act he committed. the killers become as famous as the people they killed. and it's really up fortunate. >> as with almost any famous tragic event, conspiracy theories have sprouted up regarding the shooting. john lennon. the prevailing scenario has mark david chapman as a patsy, programmed by mysterious government operatives to kill lennon. >> there was absolutely no evidence that he was assisted or aids by another person. he was simply someone who acted