Why do brutus' attempts to justify the killing of Caesar fail?

Brutus' attempts to justify the killing of Caesar fail primarily because he underestimates the emotional bonds and loyalty of the Roman people to Caesar. His rational arguments about the potential tyranny of Caesar do not resonate with the public, who view Caesar as a beloved leader. Additionally, Brutus' idealism clashes with the reality of political power dynamics, leading to a disconnect between his intentions and the people's perceptions. Ultimately, his failure to connect emotionally with the citizens contributes to the collapse of his justification.