What are the bad thing Brutus did?

Brutus, in Shakespeare's "Julius Caesar," commits several significant missteps. Firstly, he betrays his close friend Julius Caesar by participating in the assassination, believing it to be for the greater good of Rome. This act of betrayal leads to political chaos and civil war. Additionally, his naivety and idealism in underestimating the consequences of the assassination ultimately result in tragic outcomes for himself and the republic.