It is unfair to make the comparisons that your are making. There is a quantum difference in the "rules" of use between the military and police. There are specific rules for the military and when those rules are in place action can be taken. And that action is shoot to kill.
It is not the same with police. Also all of the stories about "police error" never have all the information. We never hear about how long this situation went on and what the police did prior to shooting nor what the victim did or did not do. If the deceased had followed the instructions of the police there would have been no shooting. Police firing their weapon is in the same category of the country putting its military in harms way, last resort.