What motivates Decius to tell Caesar that his wife's dream was a misinterpretation?

Decius is motivated to tell Caesar that his wife's dream was a misinterpretation primarily to ensure that Caesar goes to the Capitol. Decius understands the significance of Caesar's presence at the Capitol, especially in the context of the conspirators' plan to assassinate him. By downplaying Calpurnia's foreboding dream and reinterpreting it in a positive light, Decius appeals to Caesar's pride and ambition, emphasizing that the dream does not predict danger but, rather, signifies something favorable. This manipulation is crucial for the conspirators as they need Caesar to be in a specific location to carry out their plot.

In this scenario, Decius’s interpretation serves a dual purpose: it not only alleviates Caesar’s fears but also aligns with the conspirators' objectives. This strategic communication showcases Decius's role in the unfolding events, where his primary intention is to influence Caesar's actions and facilitate the conspirators' plans.