Of course Brown's actions on the day of the shooting led to his death. Your suggestion that anybody here thinks otherwise suggests that you have not understood the issues being raised in this thread.
You don't seem to like the idea that alternative actions by Wilson would also not have led to Brown's death and at least some of those actions might be problematic. It is much easier to identify with a cop bravely doing his duty than a young man who has just committed a serious crime. And from there it is much easier to see everything that Wilson did as proper.
But was everything that Wilson did proper? As Randfan has pointed out several times, nobody knows except Wilson. Did he politely confront the two guys walking in the street and then choose to ignore them when they disrespected him and continued to walk in the street? The Arman video suggests that this is unlikely. Did Wilson truthfully represent the situation? Again the Arman video suggests that Wilson probably didn't.
When Wilson backed up and confronted the Brown and Johnson the second time was he really just trying to delay them until backup arrived? I doubt it. The more likely situation is that he was pissed and wanted his chance at some vengeance. He recklessly put himself in danger by putting himself right next to two potentially violent felons. What did he hope to accomplish by putting himself right next to Brown and Wilson? If they were truly dangerous felons his actions put himself in grave danger as he gave himself no maneuvering room if something bad happened.
So then what happens? His poor decision to place himself in unnecessary danger had allowed Brown to almost overwhelm him in a fight. And was Wilson completely innocent here for the initiation of the fight? Maybe not. Brown is likely to have been panicked by the car coming rapidly towards him. So Brown, a young man, who are prone to mistakes of judgement, made a horrible decision to attack Wilson. But did Wilson bear some responsibility here? Again as RandFan has pointed out nobody can know since nobody can know exactly what happened but if Wilson was unnecessarily hostile as he was in the Arman video and then Wilson drove his car in a way that caused Brown to panic then I think Wilson's poor decisions were a definite contributor to a bad situation. ETA: It is also likely that Wilson was the first to grab for the gun. Brown probably made the horrible decision to assault Wilson, and then when Wilson attempts to get at his gun the stakes ratchet up again in a way that forces Brown to make a life or death decision to stop Wilson from getting his gun or to allow Wilson to get his gun and potentially shoot Brown. So Brown is guilty of assaulting somebody that has disrespected him and driven his vehicle in close proximity to him but Brown's decision to go for Wilson's gun may have been forced on him.
And then Wilson sets out on foot to chase Brown. Was that a good decision? Wilson argued that it was because he had just confronted a violent assailant and he didn't want another policemen to need to deal with him unaware. I buy that a bit. Still was it a good decision given that backup was near by and that arresting Brown at this point was probably going to require shooting him since given the situation it was unlikely that Brown was going to surrender voluntarily? I don't know, but I would say his decision was at least questionable.
And finally there is the shooting. I tend to believe most of the Wilson supporters here. I think they have made good use of the physical evidence to suggest a likely scenario although if I understand the arguments it seems much more likely to me that the final shots to Brown occur as he is falling down. Could Wilson have made different decisions in this encounter? Again as RandFan has said nobody knows exactly what went on here, but it certainly seems at least possible that once Brown had sustained significant harm from bullets striking him that Wilson could have retreated more to reduce the need to keep firing. ETA: It is also possible that Brown makes some sort of an attempt to surrender between the time the shooting starts and the time it ends. Again nobody knows but I don't think the physical evidence precludes that.
Lastly, I am in complete agreement with people that argue that there was insufficient evidence to indict Wilson. If put in the normal context of a trial based on reasonable doubt this case is awash in it. I also don't agree with stanfr's criticism of the DA for acting as a defense attorney. The two sides in a criminal prosecution do not have symmetrical motivations. The prosecution side is supposed to be driven by the pursuit of truth and justice. The defense side is primarily driven by his client's interest. So the DA used the GJ to get all the facts available out there and let somebody else make the decision as to whether to prosecute Wilson or not. I don't see any ethical violations here unless the DA intentionally obfuscated the facts or buried facts that were harmful to Wilson. If Stanfr could show that the DA did that I would be in agreement with Stanfr that the DA acted inappropriately.