How does the imagery in this excerpt create a tone that will encourage the listeners not to kill Leopold and Loeb?

…both these boys at a time seeking to adjust their young lives to the world, moved by the strongest feelings and passions that have ever moved men, both these boys at the time boys grow insane, at the time crimes are committed, all this added to all the rest of the vagaries do you charge them with the responsibility that we may have a hanging, that we may deck Chicago in a holiday garb and let the people have their fill of blood, 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?

The imagery creates a celebratory tone; Darrow wants the audience to imagine how happy Leopold and Loeb will be when they are set free.

The imagery creates a nostalgic, even sentimental tone, designed to remind the audience of their own teenage years and experiences.
The imagery creates a bloodthirsty, violent tone intended to turn the audience against the death penalty.

The imagery creates a scolding, judgmental tone; Darrow wants to reassure the audience that Loeb and Leopold will still suffer the consequences of their crime.