In addition to furthering the plot, I always thought it was a critical scene for character development. Rather than an emotional outburst, he makes a statement in a calm, measured, almost subdued tone of voice. I always thought that particular scene showed that Vincent had bought-in to Michael's style of management of acquiring information and making a rational decision, rather than responding with reckless violence.

Vincent, at that moment, is less emotional and more rational. Less like Sonny and and more like Michael.

tony b.