Answer:
They are angry and vow to kill those who committed the crime.
In Act III, Scene II of "Julius Caesar," the crowd feels enraged and want to avenge his death when Antony shows them Caesar's wounds. At first, Brutus convinces people that he has killed Caesar because Caesar was too ambitious. Thus, before Antony speaks, the crowd trusts Brutus' right to kill Caesar, and considers the latter a tyrant. However, Antony's display of Caesar's stabs outrages Romans, who want to assassinate his murders: "Revenge! Let’s go after them! Seek! Burn! Set fire! Kill! Slay! Leave no traitors alive!"
All of these could be considered an "author's purpose". An author is technically anyone who writes anything, therefore the purpose of writing is theoretically limitless. If you have to choose one of these, however, it would be "to remind".
It's Called Chivalry. It is their chief honor code, instituted in the middle ages.
