This sort of thing just mystifies me. I have nightmares where a false story has gotten into one of my stories by accident; I wake up with a sick start, and the relief when I realize that it was just a dream is sweet indeed. I cannot imagine the thought process that would lead you to do this on purpose. Leave aside the morality of it for the nonce--aren't people afraid of getting caught? In this day and age, how can you hope to get away with passing off a photo of an Islamabad think-tanker as a terrorist who kidnapped you?
Fear of Fact-Check
Lying on the level that Mortenson was, or even at a Jason Blair/Stephen Glass level, requires a kind of moral calculus which I've never completely understood