In form, “12 Angry Men” is a courtroom drama. In purpose, it’s a crash course in those passages of the Constitution that promise defendants a fair trial and the presumption of innocence.Click to see full answer. Accordingly, what is the purpose of 12 Angry Men?This courtroom drama tells the story of a jury of 12 men as they deliberate the conviction or acquittal of an 18-year old defendant on the basis of reasonable doubt, forcing the jurors to question their morals and values.Also Know, is 12 Angry Men A real story? Twelve Angry Men is a courtroom drama written by Reginald Rose concerning the jury of a homicide trial. It was broadcast initially as a television play in 1954. The following year it was adapted for the stage, and in 1957 was made into a film. Similarly one may ask, what’s the theme of 12 Angry Men? Justice. As a play portraying the deliberations of a jury in a murder trial, Twelve Angry Men is naturally concerned with the idea of justice. Yet the play does not represent either the American criminal justice system or the abstract concept of justice as simple or clear.Why does Juror 12 change his vote?Jurors 12 and 4 change their vote to “not guilty”. Juror 10, who says he still thinks the defendant is guilty, bluntly admits to no longer caring about the verdict and votes for acquittal.