What is one of the most important reasons the U.S. Constitution guarantees a right to a jury trial in criminal cases? Jurors allow the judge to focus on managing the courtroom instead of whether or not the defendant is guilty. Jurors are a group of diverse individuals who must find agreement about the facts of the case. Jurors are a group of people who must explain and obey the instructions the judge gives them. Jurors get a chance to take part in a constitutional responsibility of citizens.