What concern does Cassius express about Brutus' involvement in the conspiracy?

Cassius expresses concern about Brutus' involvement in the conspiracy because Brutus’s reputation could lead to public outrage. Brutus is highly respected in Rome and is seen as an honorable figure. If he participates in the assassination of Caesar, it could lend legitimacy to their actions, but it could also provoke significant backlash from the public who view him as a noble character. This intensified scrutiny due to Brutus's status creates a potential danger for the conspirators, as the general populace may rally in defense of Brutus if they perceive the conspiracy as unjust. His honor amplifies the stakes of their plan, making it crucial for the conspirators to ensure that Brutus' involvement doesn't backfire and turn public sentiment against them.