Public opinion leading up to and during the Revolutionary War was much more complicated than most people understand. We were never united for independence, and a bare one third of people supported the war in the beginning, and actually, probably less than that.
In that kind of environment, and with so much at stake, shaping public opinion, whether through media or through propaganda, was crucial to the Revolutionary effort. In this way, Britain was its own worst enemy. They could not help acting like an empire and a monarchy, so when the crackdown on the colonies grew to violence in the streets (Boston, 1770) and to embargo against an entire colony (Massachusetts 1773), news and propaganda recruited supporters and support for the independence drive. Without it, we would have stayed loyal, and the revolutionary army would have had no chance at success.