While the passage does use the term "boys" which could create a sense of nostalgia, the imagery clearly creates a very serious and judgmental tone, which makes the audience responsible for the execution. There isn't any reference to anything cheerful, although the word "holiday" is used. There is also no reference to anything that would indicate the author wants the audience to think about how the boys were raised. The audience is made to feel the burden of responsibility of the hanging of the boys.
A line such as "you charge them with the responsibility that we may have a hanging" clearly implicates the audience. YOU are responsible. Also the line, "that we may deck Chicago in a holiday garb and let the people have their fill of blood", implicates everybody who would be celebrating in witnessing the hanging, meaning the audience, again. The audience in meant to imagine celebrating whilst drinking blood, literally the blood of the dead boys and a metaphor for their involvement. Finally, the line, "that you may put stains upon the heart of every man, woman and child on that day and that the dead walls of Chicago will tell the story of blood", implicates the audience by "staining" them with the blood of the dead. A mark of guilt would metaphorically be on every man, woman, and child's hearts forever. In this passage the audience is being led away from the death penalty with harsh phrases that implicate them in the decision they make. Clearly, a better alternative would be to punish the boys in another way, alleviating the audience from the guilt and responsibility of their deaths.
