Why does Antony use Caesar's will to persuade the people that Caesar was not a tyrant?

Having set
the crowd against Brutus and his followers by repeatedly mocking Brutus's assertion of being
honorable, Antony, a skillful speaker, knows that the crowd will be further swayed by evidence
of how much Caesar loved them. He wants the common people to understand that the assassination
of Caesar by Brutus and his fellow senators was not done for the benefit of the masses. The will
will clinch Antony's case.

Telling the crowd that Caesar loved them so much
he remembered them in his will moves the crowd to a great wave of tenderness toward Caesar and
to feel even more regret that he was killed, as does Antony carrying in Caesar's bloody corpse
for them to see. The good heart of Caesar and his fragility in death does exactly what Antony
intends, which is to set the crowd furiously against the assassins.

Antony
wants the Roman people to see the assassins as cold-blooded killers after their own gain, and he
is successful. He is very angry that his dear friend has been killed and wants the killers to be
punished, which happens when a civil war breaks out.