(Bart removed the head of statue of their town founder. And he and his father were pursued by angry people, who cornered them finally.)
Folks: off the kid, man. Off him! Kill Bart! Kill Homer! Let's kill this guy!
Bart: Murderous mob, I beg you to spare our lives. At least until you've heard
the story of how we ended up...with the head of our beloved town founder.
I am wondering why Bart used 'murderous' and 'mob' to address the folks and asked them to forgive them.
'Mob' is prerogative word, isn't it. And so is 'murderous'.
Cambridge Dictionaries Online - Cambridge University Pressmob (CROWD)
1 [C] USUALLY DISAPPROVING
a large angry crowd, especially one which could easily become violent:
The angry mob outside the jail was/were ready to riot.
a lynch mob
Fifty people were killed in three days of mob violence.
2 [C] INFORMAL a group of people who are friends or who are similar in some way:
The usual mob were/was hanging out at the bar.
3 [S] INFORMAL an organization of criminals:
a New York mob leader
Thanks in advance!
BobK, thank you for your answer and correction.