Wilson was not able to arrest the boy. He was only able to kill him and even then only from a distance. You don't pick a fight with someone that is your clear better in a fight... not unless you are well armed and intend to kill him from a distance.I suppose that you'd rather the Police let violent offenders run away as they cower in their cruisers? Officer Wilson's JOB is to arrest people like Michael Brown...not to wait for backup. Someone who's brazen enough to commit strong arm robbery at noon time...stroll down the middle of the street holding what you stole in your hand...refuse to obey a police officer's request to get out of the middle of the street...and then physically attack said police officer when it dawns on him that you're the guy they are looking for in a convenience store robbery? It's obvious that Michael Brown is not the "gentle giant" that he was made out to be. He had decided to be a thug that Saturday morning and it didn't end well for him.
Do you not know that Brown had turned back to Wilson and closed the distance to about 15 feet away when the fatal shot was fired? Police aren't trained to make confrontations with violent felons a "fair fight"...they are trained to use whatever level of force is necessary to come out on top in that confrontation.