The same thing happened in the Trayvon Martin case. It's really obvious when you look at it. With Wilson, for some reason Mike Brown decides to reach into and SUV (not a car) and make an attempt to grab the officer's gun on his right hip while holstered (through the window). During this, he's also allegedly striking an armed officer in his vehicle and then decides to run away after he's shot. Then Wilson pursues and Mike Brown stops running away, decides to taunt the officer, and then charge an officer with a gun. It makes no sense.
Just like with Trayvon, Zimmernan kept escalating things. For some reason, Trayvon was close to his home and then decides to turn around and confront a person he was already trying to get away from. Then Zimmerman would have us believe the Trayvon threatened to kill him (for being followed) and then attempted to grab his gun.
It seems all too convenient that there's always some sort of escalation of violence when anyone with common sense can objectively look at things and say, "That doesn't make sense." Apparently, occam's razor doesn't exist.
Occam's razor was still in play. You just have to filter the logic through white privilege first.