It is murder. When you create a situation where death will occur and are repeatedly warned that a->b you are a murderer. Now if some fancy lawyer type wants to call it negligent homicide or something they are welcome to. Still murder and in my eyes at least probably should be considered terrorism as well.
Now let’s dive into what you call an argument. Is a broken down motorist the same exact thing as a person blocking an ambulance, repeatedly, being informed that they are blocking an ambulance, and even after being informed continues to do so? No? Ok so if two things are not the same why are you strawmaning me into making them the same?
Action
You are really going to make it easier for the prosecution later during your trial for setting off some explosives.