Reply #2: Selective Memory

[formercia]

The George Tenet Syndrome:

http://en.wikipedia.org/wiki/Firing_squad

In some cases, one member of the firing squad is issued a weapon containing a blank cartridge instead of one with a bullet, without telling any of them to whom it has been given. This is believed to reduce flinching by individual members of the firing squad, making the execution process more reliable. It also allows each member of the firing squad a chance to believe afterward that he did not personally fire a fatal shot. This reinforces the sense of diffusion of responsibility. While an experienced marksman can tell the difference between a blank and a live cartridge based on the recoil (the blank will have much lower recoil), there is a significant psychological incentive not to pay attention and, over time, to remember the recoil as soft.