It's more about the person driving the medic unit taking the emotion out of driving with lights and sirens.
If I had tapped my brakes that guy would have plowed into me, and it would have been his fault.
I've worked with plenty of people, new EMTs and long time medics, who get so riled up when they drive code, it's scary. One guy, a former supervisor, would get so mad at traffic he'd turn red and spittle would fly from his mouth as he cursed out the drivers in front of us. This would be a while driving to a 33charlie call. (Aka: ALS/routine nursing home call)
I transported a patient with a femur fx to a trauma center a few weeks ago and the EMT drive so recklessly and erratically that I had to write her up after telling her three times (with no result) to shut off the lights and siren.
I honestly think we should take the lights and sirens off EMS units. Especially BLS units.