Anyhoo, steering the conversation away from silly bickering and back towards a conversation...
A situation like that detective's was bound to happen and be documented/reported, but now that it has, I think it will be referred to at the next shooting of an unarmed person.
Two points I see in this conversation is that people tend to gravitate, regardless of evidence, to the side assigned to their political belief or person experience (the police disappointed/helped me on x date, therefore all police all likely to be the same) and a usually complete misunderstanding of the speed and dynamics of an unarmed fight.