Who killed the Palermo Mulero?

A murder in the Molino Muleiro novel, a detective story set in Latin America (specifically in Peru), searching for who killed Muleiro, the simple boy whose body was found by a shepherd and was horrifyingly mutilated. So what are the real reasons that led to the killing of Muleiro, that peasant of Indian origins... Perhaps the young man violated a social and political taboo that compelled the people of the country to issue a verdict making his killing permissible and not punishable by his perpetrators. This is what "Yusa" will investigate as he explores many characteristics of rural society in Latin America. ... "The young man was hanged and fixed to the old carob tree, in a absurd position that made him look more like a scarecrow or a carnival doll with open legs than a corpse. They depicted him with this unlimited hatred, like killing or distancing him: his nose and mouth were slit, and his body had dried blood crusts, bruises, cracks, cigarette burns (...) he was barefoot, and naked from his waist down to his feet, wearing only a torn undershirt. He is a slim, dark-skinned young man, with prominent bones (...) one of the air force soldiers brought to the airbase in the recent conscription campaign - and the old man's features brightened - it is him: the Peruvian singing bolero melodies ..." But this alone is not enough to solve the mystery of who killed him... !?