BOGOTA, Colombia — The army stumbled on the handwritten diary during a raid on a guerrilla camp. It lay near the embers of a communal kitchen where fleeing rebels left their breakfast untouched. "I'm tired, tired of the FARC, tired of the people, tired of communal living. Tired of never having anything for myself," wrote the author, a 29-year-old Dutch woman. Colombia's government couldn't have hoped for better propaganda against the Revolutionary Armed Forces of Colombia, or FARC. It leaked excerpts from the diary found last June to the media, even making available an English translation of the Dutch entries....