Answer: to suggest that Caesar's opponents are as illogical as wild animals
Explanation: In Act III, Scene II, of "Julius Caesar" by William Shakespeare, Mark Antony in his speech uses the phrase "brutish beasts" to suggest that Caesar's opponents are as illogical as wild animals. Mark Antony is allowed by Brutus to deliver a speech at Caesar's funeral. He is trying to make people think about the difference between what they have been told and what Caesar really was, to make them angry for Caesar's assassination.