When I first saw the film "Mission", I didn't know how I got home after that movie was over.  Later I explained to my mother probably I lost my mind in Iguazu Falls too, as somehow I felt deeply related to the character Rodrigo Mendoza, played by Robert de Niro. 

This Rodrigo Mendoza, a mercenary and slaver, makes his living kidnapping Guaranis and other indigenous people and selling them to the nearby plantations. He is shown to have a human side, however, caring deeply both for his brother and fiancee. However, when he finds his brother in bed with his fiancee, Mendoza stabs him in a jealous rage and then spirals into extreme guilt and depression over what he has done. Seeking repentance from the Jesuit missionaries, he begs them not to make his penance too light. Father Gabriel, who has temporarily returned from beyond the falls, takes Mendoza's armor and weapons, ties them in a satchel, and attaches the satchel to Mendoza's waist. In one of the movie's most memorable scenes, he then assigns Mendoza to scale the Iguazu Falls again and again. Mendoza, still proud and bitter despite his guilt, refuses help and proceeds to scale the falls until he collapses and cries out to God. Father Gabriel then releases him from his penance, and the armor is symbolically thrown into the falls. Mendoza then goes on to take a vow of nonviolence and become a Jesuit under Father Gabriel, and in time is accepted by the same Indians he used to kidnap.

So when all the priests and most of the adult Guaranis are massacred by colonists, only a handful of women and children running away into the jungle, and a deep burn in the jungle, Gabriel's broken oboe, and a shattered violin lying along the river are the only traces left of the mission, my fiath in humanity was fainted away into the background mist too.