Answer:
No, Cassius was not justified in conspiring against Caesar. Unlike Brutus, his motives are rooted purely in jealousy and his own personal ambitions. He knew that he could never achieve a position of real influence or power in the shadow of Caesar's successes. Ultimately, his primary motive was to remove a rival who dominated the political and ideological landscape of Rome and to give himself a platform to achieve his own dreams of power and prominence.