What more would it accomplish? It would just be emotional ranting. Often that kind of thing adds more adversarial elements to the problem and improves nothing.
I'm not suggesting he work himself into a foaming-at-the-mouth sort of rage, but there's an unsettling disconnect between the subject matter -- the plight of generations of students caught in bad public schools -- and his emotional tone. Personally, I value sincere communication and feel a little anxious when someone is forcing me to read between the lines. There is a place for justified anger in communication, as long as it remains civil.
As for the practical consequences, if there is a congruency between the words and how they are expressed (body language, tone, etc.), the message tends to land a little heavier.
