what are the 4 main arguments for the boy's guilt in the case in act one

Ultimately, they decide to go around the table, explaining why they believe the boy to be guilty, in hopes of convincing 8th Juror.

Through this discussion we learn the following facts about the case: an old man living beneath the boy and his father testified that he heard upstairs a fight, the boy shouting, “I’m gonna kill you,” a body hitting the ground, and then he saw the boy running down the stairs. The boy claimed he had been at the movies while his father was murdered, but couldn’t remember the name of the movies or who was in them. A woman living across the street testified that she saw the boy kill his father through the windows of a passing elevated train. The boy had, that night, had an argument with his father, which resulted in the boy’s father hitting him twice. Finally, the boy has an extensive list of prior offenses, including trying to slash another teenager with a knife.

3rd Juror makes a speech about how this boy is just another example of “how kids are nowadays.” He speaks about his own son, with whom he had a rough relationship, and to whom he hasn’t spoken in two years, after a fight in which his son hit him. 10th Juror and 5th Juror get into an argument over 10th Juror’s citing the boy’s slum background as evidence for his being “trash.” 5th Juror is angered by this, having grown up in a slum himself.