> They've got a fraction of a second to decide whether someone is a threat or not.
A fraction of a second? They weren't piloting an F-14 in Top Gun or something, there was a visibly unarmed elderly guy shuffling towards them alone on the sidewalk. It was literally the opposite of a situation that demanded split-second decision making.
As with the grandparent comment, I question whether you even watched the video of the incident or if you are just repeating some stupid stuff you heard about the incident.