You seem to forget that there are over 300 million people in the USA, 50 states, hundreds of counties and thousands of cities and municipalities. And who knows how many fire departments. Each has its own rules and laws. But yet YOU are going to tell ME what I know about my own local laws and rules, that I know the motor vehicle code says to stop. I know no such thing. I know that I've been told by several different instructors that Maryland's law does not say an emergency vehicle is absolutely required to stop at all stop signs and red lights. Nor do they specify the maximum amount over the speed limit emergency vehicles can go. I know that county departments, or even individual volunteer companies, can put in place rules that are stricter than the local law.
If the fire department rules and guidelines states that a piece of fire apparatus shall come to a complete stop for red traffic signals and for stop signs, then by the rules your are suppose to stop.
In some departments, which I am familiar with, have rules like this. If the driver blows a light or stop sign, then the driver and officer will have charges preferred upon them for violating the rules and guidelines.
If I was the Officer in the front seat and you or anyone else was driving and disobeyed the rules as you say, don't stop, you mister would be in serious trouble.