It goes well beyond a mistake. There is a lot that is suspicious about the police behaviour. At the very least they lied after the incident. It is unfortunate it was not possible to put together enough evidence to bring criminal charges against the police involved.
Apparently, it was more like seven mistakes in the head and one in the shoulder.
Hmmm, I think the police often get blamed for things that are not their fault BUT in this case they got off WAY TOO EASY. The entire operation was totally botched and then the police covered up information. Also seven head shots are inexcusable.