I think we can all agree that the cop was in the wrong. It's unlikely anyone will defend him parking the car on freaking railroad tracks.
But that doesn't mean she's an innocent cherub. There can be two bad guys and no good guys in a situation. The cop will be punished accordingly, while the woman who was road raging with a gun will get a big ass settlement. The good news is that she'll likely end up a chalk outline when she either ODs or is beaten to death by her boyfriend.