WASHINGTON—Attorney General Eric Holder turned in his letter of resignation to President Barack Obama Thursday after discovering that people willfully participate in the killing of other human beings on a routine basis. "I am stunned," a pale and shaking Holder said. "That's just horrible. People really do that? My God, why?" Sources close to Holder said that he is seeking a position in which he will be less likely to encounter man's inhumanity toward man, perhaps in child protective services.