Final answer:
Cassius may not be considered a noble hero as his motivations are rooted in envy and manipulation, deviating from Aristotle's tragic hero attributes, which include nobility and a personal fault leading to downfall.
Step-by-step explanation:
An argument against Cassius being seen as a noble hero who is brought down by his own fault would delve into the complex nature of his character as depicted in Shakespeare's Julius Caesar. While Aristotle's notion of a tragic hero includes nobility and a fall due to a personal flaw, Cassius's actions and motivations can be interpreted as driven by envy, manipulation, and political machinations rather than nobility. He lacks the noble qualities that would inspire empathy or serve as a moral lesson to the audience, which are quintessential to Aristotle's definition of a tragic hero. His downfall seems to result not from a tragic flaw, or 'hamartia', but rather from a calculated risk gone awry, which blurs the line between personal fault and external circumstance.