There are many unanswered questions. I've seen some opinions indicating that since Zimmerman was following Martin in his car, then he was the "aggressor" and responsible for everything that transpired afterward. That is not necessarily true.
Though following someone in your car and observing them may be construed as aggression at some level, the law expects you to meet such an act with behavior appropriate to that level. I don't think merely being followed by someone justifies jumping them and wailing on them with your fists, even if they got out of the car and asked you what you were doing. This line of reasoning, if you want to call it reasoning, is one that many DUmmies are taking to cover Martin if he was indeed the one who initiated physical contact. They are also dramatizing it by calling Zimmerman's actions "stalking", which has a fairly clear definition under Florida law, and Zimmerman's actions do not rise to that level. If Martin jumped him simply because he was pissed off about being followed and questioned, then Zimmerman may have a case for self-defense. The fact that Zimmerman may be a racist or any kind of asshole doesn't change that.
Now it may well be that Zimmerman initiated the physical contact, or he may have verbally threatened Martin, chased him, brandished his gun, or tried to forcibly detain him in some way. In that case, all bets would be off, and Martin could use whatever means necessary to defend himself. Zimmerman would be in the wrong for using his weapon, and he should face the full penalties of the law.
The point is, we don't know which of those scenarios, or even one totally different, took place that night. There is certainly enough plausible evidence to suggest that it might have been self-defense on the part of Zimmerman. It needs more investigating. Did SPD act appropriately? I don't know that, either. I'm willing to see the results of that investigation also.
All this crap from The Hive about, "B-b-but, we just want to see him arrested!" is a total crock of shit. All they've seen from the very get-go is a black person dead at the hands of a "white" person and that's all the evidence they've needed to be calling for his head, facts be damned. Posters over there who have counselled patience or have tried to critically examine the evidence or present alternate scenarios have been attacked savagely, accused of being trolls or "defending" Zimmerman. Some have even admitted that their minds are made up and no contradictory evidence will change them.
This is nothing more than attempt to make political hay out of a tragedy. One that is similar to others that happen on a daily basis across the country except that this one just happens to be convenient to their purposes. It's stoking the fires of race-hate in an election year. They don't care about the black-on-white hate crimes. The few that make it to being posted at DU get short shrift, or get written off as the natural consequences of poverty and the reaction of a downtrodden minority to severe oppression or other such apologia. Neither will they acknowledge that 90+% of blacks murdered are the victims of other blacks. That hasn't been mentioned once. Wouldn't you think that group who claims to be so concerned about the plight of minorities would give that at least a passing glance?