Rubbish.
The Al-Qaeda killers and the Washington sniper both had a need for recognition. The difference was that the Al-Quaeda killers weren't worried about their identities being discovered after their crime.
The media putting out the message that arrogance will get you caught will not teach killers to be less arrogant. If they stop being arrogant they won't kill in the first place.
The most dangerous killers are the ones who feel no need for recognition from the outside world, usually because they are a close knit team of two or more people. Fred and Rosemary West were a case in point. Similarly killers whose reason for killing was sexual or sadistic also trip up far less, and are only ever caught when one of their victims escapes their clutches.
Television has an important part to play in educating the public. Killers and Al-Qaeda operatives can get their knowledge from other places.