No one is. Therefore we make subjective judgements based on the "flaws" we know of. For example, does evidence that Trayvon might have once smoked pot make him more likely to attack people, or more likely to crave Cheetohs? And how does this compare, when we are talking about a history of violent assault, to Zimmerman with multiple priors for assault, including assault on a police officer?
Neither is an angel, but that doesn't make both (or either) the devil.
You are not alone in misunderstanding this critical point -- likely because quite a few pundits are deliberately confusing the issue. This case is about homicide, not assault. It is completely irrelevant who attacked who. The ONLY thing relevant is what took place at the moment Zimmerman decided to pull the trigger. Trayvon could have rode up to Zimmerman on a unicycle, hit him in the face with a pie, bonked him with a rubber mallet, pantsed him, and they backflipped his way down the sidewalk, and it has no bearing on the legality of Zimmerman KILLING him. Homicide is only justified if the killer can convince a jury that he had a reasonable fear for his (or someone else's) life and that no other option was available -- he had to be stopped immediately.
Actually I do, having experienced both the threat, and the attempt, many times. However, my experience is not yours or Zimmermans. I will give you this: no one knows how they will react, and all the training in the world doesn't change this. Whether or not someone's reaction was appropriate is subjective, we can and do debate it. The standard for most things like this is "reasonable." What would Joe Blow do in a similar situation. That's why we have juries -- and for a jury to convict ALL TWELVE have to agree that the suspect did not act in a reasonable manner. It's tough to get twelve people to agree what toppings to put on a pizza, so if you can get twelve to agree a shoot was bad it was probably bad.
Nice lesson. I agree. What we do not know we do not know. Where we differ is this:
Because millions of reasonable people believe that the police have failed to do their job here (either due to incompetence, corruption, or outright racism), and given that this department apparently has a history of just this, and given that the police in this case have had plenty of time and have used that time to conceal rather than reveal information, it is reasonable to demand that information.
In other words, we NEED to know what we currently do not know. If the police conduct has been correct, then we need to know this so we can put this mess behind us. If it has not been correct, we need to know this as well so we can remove the cancer and begin healing. What we cannot do is allow this wound to fester, Trayvon and all the future Trayvon's demand better, and we all should as well.
The time for obstruction and games is over. We need these answers today.