Once you go deeper into the story, you see how he turns down the advice of Cassius numerous amounts of time.
Brutus asks several of his friends to help him commit suicide, but they all refuse except for Strato. Macbeth was one of these works as he wrote this in to honor James I becoming the king of England.
Being able to fall into all five of the characteristics of a tragic hero, makes Marcus Brutus the tragic hero of the play and not Julius Caesar as the title of the play implies.
They saw it as not harming the people but helping them. When Brutus realizes that his good friends have died because of the battle he has caused he realizes he should kill himself.
However, though Brutus does have ample credibility and taps into the emotional link with his audience to some extent, he does not convey as powerful of an argument as Antony, as he fails to provide sufficient factual evidence.
However, the title is appropriate, as Julius Caesar, though insignificant as an actor in the play since he dies in Act 3 having a minimal amount of lines, impacts the characters in the play is a very significant way.
Brutus believes that the Romans will understand the justification of his actions over anything Antony will say and so allows Antony speak.
His reason for this being that it would simply be too much to kill both him and Julius Caesar. In the end, Brutus recognizes that his miscalculations and bad decisions cost him everything, but by then there was nothing he could do to change the course of events and so had to accept them.
They did it for the better of the people.