Assassins Don't Do Movie Plots, Either
From “Assassination in the United States: An Operational Study of Recent Assassins, Attackers, and Near-Lethal Approachers,” (a 1999 article published in the Journal of Forensic Sciences):
Few attackers or near-lethal approachers possessed the cunning or the bravado of assassins in popular movies or novels. The reality of American assassination is much more mundane, more banal than assassinations depicted on the screen. Neither monsters nor martyrs, recent American assassins, attackers, and near-lethal approachers engaged in pre-incident patterns of thinking and behaviour.
The quote is from the last page. The whole thing is interesting reading.