Et Tu, Brute...They're Small

Beware the ides of March...

So, was Brutus right to participate in the assassination of Caesar? Was it for the greater good or was it an act of betrayal, or both? If Caesar was trying to usurp power that was not his to take, would that have freed Brutus from the bonds of friendship and loyalty? Would it have forced him from the relationship making questions of betrayal irrelevant? When someone is your friend, does it matter, for the sake of the relationship, what they do to others?