Did you ever see Natural Born Killers? It's way over the top, but it is actually one of Oliver Stone's better movies, even if it is really gory in parts.
The media and culture make celebrities out of people like Dorner or Manson. Remember Geraldo going to interview Manson in prison? He went there and provoked Manson into acting crazy, and into threatening him, threats which Geraldo publicized to try to make him look like a tougher "journalist". The public eats this crap up.