His father was an officer who was shot dead by a black person, you honestly don't think that causes him any bias at all?
Almost everybody in the legal system has to divorce their bias from their job. So no. I wouldn't default to saying that situation would turn him into a racist or even give him a bias. Of course it could have been what drove him to be a prosecutor but his case history shows without doubt that he can and will prosecute anybody, white/black, etc. if he thinks they're a crook.
Everyone is human. Everyone uses their judgement. It's easy to scream bias, bigot, racist, etc. when you don't agree with someone's judgement because it's easier to disqualify their judgement outright than it is to argue the merits of it.
One of my best friends was shot in the face (and chest and neck) by a white cop. Trust me, I was completely ready to throw Wilson in front of the firing squad when the story first broke.
But I think people just aren't happy with the outcome because it doesn't fit the narrative they were emotionally invested in (like I was at first) and they are simply too invested into this narrative to abandon it, and instead are grasping at straws to justify their investment.
This is why I feel like those still arguing about this case (and not the merits of actual police oppression) are simply trying to reconcile reality to their perception. Trying to accuse McCullough of being a racist, etc. is just grasping for straws and it will go nowhere.
It's sad, and I'm totally for protesting against police violence, etc. But I also don't think, in anyway, that the Mike Brown shooting was the case to run with. Fuck Mike Brown and fuck people like him who think they can bully people, tell cops to fuck off, etc. Dude was a douche and his attitude got him killed.
PS: I've watched giant black men like Mike Brown get beat down by cops in St. Louis before. And all 3 times it was other black cops doing the beating. So once the truth came out about Mike Brown, his attitude, etc. it was pretty clear to me he was just another crazy 'thug' that thought he was invincible. Fuck that guy. Fuck that guy in particular.
PSS: What's sad, to me, is that I think had Wilson actually executed Brown in cold blood, and the facts been there to make a case of it, McCullough would have been the guy to prosecute it because he would have indicted him right away, and gone after him with a vengeance. I read some case overviews and it was clear that if McCullough thought you were a dirty cop, he came after you like a pitbull.