Anyone who has participated in a frustrating political discussion, and seeks insight into the psychological dynamics, or an online debate and wants to imagine what it would be like in real life ought to rent '12 Angry Men,' (link to Netflix), the 1957 classic about jury deliberations in a murder trial and how 'reasonable doubts' are developed. It's a psychological thriller. As The New York Times noted:
"One of the Jurors, #3 (Lee J. Cobb), a bullying self-made man, has estranged himself from his own son. Juror #7 (Jack Warden) has an ingrained mistrust of foreigners; so, to a lesser extent, does Juror #6 (Edward Binns). Jurors #10 (Ed Begley) and #11 (George Voskovec), so certain of the infallibility of the Law, assume that if the boy was arrested, he must be guilty. Juror #4 (E.G. Marshall) is an advocate of dispassionate deductive reasoning. Juror #5 (Jack Klugman), like the defendant a product of "the streets," hopes that his guilty vote will distance himself from his past. Juror #12 (Robert Webber), an advertising man, doesn't understand anything that he can't package and market. And Jurors #1 (Martin Balsam), #2 (John Fiedler) and #9 (Joseph Sweeney), anxious not to make waves, "go with the flow."
It's up to Juror #8, played by Henry Fonda, to persuade "the weary jurors to re-examine the evidence."