These are the tough questions that I wish we didn't have to struggle with as a country. And yes, that is a legitimately tough question. There's no clear answer.
The calculus we have to do is: Is the probability of a police officer making this situation better, greater than the probability of a police officer making it worse?
Often after an accident, people are concussed,
Which means they will be slow to follow commands. With the wrong US cop, this can be fatal.