I need to try and clear my mind of some thoughts that this kind of an incident brings to me. Take it as you may, since I come from a society where the relationship between citizens and law enforcement is very different - for a multitude of reasons.
Let's assume that in this instance the use of lethal force (by US law enforcement standards) was legitimate. Let's assume that the autistic man did not follow what the police told him to do. Let's assume that the toy truck was identified from a distance as a weapon. Let's assume that the police identified this as a suicidal man with a hostage.
We are still talking about trained police officers, who I would assume have had extensive training with each and every one of the firearms that they might be liable to fire in the conduct of their tasks. This was an extended period of time where the police obviously negotiated with the two men and called out orders to them, and the police had that time to line up shots in case of imminent danger.
Let us assume that the police in question did panic and in response did pull the trigger - which might I say on the assault rifles that I've handled requires a fair bit of pressure and cannot be done just by flinching - and so let ring what should be aimed shots. He hit the leg of the man who was lying lying down with his hands in the air. Not the autistic man providing a much bigger target and who was holding what might be a weapon, but the man lying down and making himself appear even less of a target.
Do the police in the United States get their badges after a two-week correspondence course or something? Why is it that these completely inept officers are allow to roam around and do no service to the actual people they are supposed to serve and protect? With all due respect America, get your fucking shit together.