We have all heard of "buck fever".
Police and military members experince something similiar when presented with something that looks kind of like, but not exactly like a target we are looking for or a possible threat. We react and hope it is all ok. Sometimes it is not ok.
I don't know if this is what happened here but I do know that the police did not, nor could they possibly have had PID. I imagine there will be huge law suit here and possibly charges brought against the offficers. Before the bullet leaves the gun make sure you know where it is going and why.
Since all the strikes indicate the vehicle was engaged from behind, was not the type or color of vehicle they were looking for, was not being driven by anyone remotely resembling the suspect etc, etc, etc....
As a civilian you will not be given the benefit of the doubt.